
In *Monster Hunter: World*, obtaining a Sleep Sac is a useful endeavor for hunters looking to craft sleep-inducing items or traps. Sleep Sacs are primarily acquired by carving large monsters that have a sleep element, such as the Kulu-Ya-Ku or the Tzitzi-Ya-Ku, though the drop rate can be relatively low. To increase your chances, ensure you have a high carving skill on your gear or bring a Capture Master skill to improve drops from captured monsters. Additionally, completing specific quests or investigations featuring these monsters can yield more opportunities to gather Sleep Sacs. Once obtained, Sleep Sacs can be used in crafting sleep weapons, ammo, or traps, making them a valuable resource for strategic hunts.
| Characteristics | Values |
|---|---|
| Item Name | Sleep Sac |
| Description | A monster organ that induces sleep when consumed. |
| Rarity | 4 |
| Primary Source | Carving from Rathian or Pink Rathian (High Rank or Master Rank). |
| Carving Rate | ~30% chance from broken parts or body carving. |
| Other Sources | - Quest rewards from specific Rathian-related quests. |
| Uses | Crafting sleep weapons, coatings, or ammo (e.g., Sleep Arrows, Sleep Bombs). |
| Game Version | Available in both High Rank (HR) and Master Rank (MR) versions. |
| Tips for Farming | - Focus on breaking Rathian's wings, head, or capturing for higher yields. |
| Alternative Methods | Trade-in via the Melder using specific materials (e.g., Rathian Plate). |
| Required Tools | None (carving knife automatically used when carving). |
| Stack Size | 99 |
| Sell Price | 600z |
| Related Monsters | Rathian, Pink Rathian (no other monsters drop Sleep Sac). |
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What You'll Learn
- Complete the Quest: Finish the A Flash in the Pan quest to unlock the Sleep Sac
- Gather Materials: Collect Sleep Herb, Poison Sac, and other required crafting materials for Sleep Sac
- Craft at Smithy: Use the Smithy to craft Sleep Sac with gathered materials in Monster Hunter World
- Use in Combat: Equip Sleep Sac to induce sleep in monsters for easier hunting
- Farm Ingredients: Farm specific monsters or areas to efficiently gather Sleep Sac components

Complete the Quest: Finish the A Flash in the Pan quest to unlock the Sleep Sac
To obtain the Sleep Sac in *Monster Hunter: World*, one of the most straightforward methods is to complete the quest "A Flash in the Pan". This quest is a key step in unlocking the Sleep Sac, which is a valuable item for trapping and capturing monsters. Here’s a detailed guide on how to achieve this:
Step 1: Accessing the Quest
"A Flash in the Pan" is a 4-star optional quest that becomes available after completing specific story progress. Ensure you have progressed far enough in the main campaign to unlock 4-star quests. Once eligible, visit the Quest Board in Astera and look for the optional quests section. The quest will be listed there, often with a distinctive icon indicating it involves capturing a monster. Accept the quest to begin your mission.
Step 2: Quest Objectives
The primary goal of "A Flash in the Pan" is to capture a Barnos. This quest takes place in the Wildspire Waste, a scorching desert zone. Your objective is to weaken the Barnos to a point where it can be captured using a Shock Trap and a Tranquilizer Bomb. The Barnos is a relatively manageable monster for hunters at this stage, but it’s crucial to come prepared with the right gear and items.
Step 3: Preparation and Execution
Before heading out, ensure you have the necessary items for capturing: Shock Traps and Tranquilizer Bombs. These can be crafted using materials like Parashrooms, Red Mushrooms, and Thunderbugs. Equip a weapon that allows for precise damage control to avoid accidentally killing the Barnos. During the fight, focus on dealing consistent damage while monitoring the monster’s health. Once the Barnos is limping and showing signs of fatigue (e.g., returning to its nest), set up the Shock Trap in its path and lure it into the trap. Use the Tranquilizer Bomb to complete the capture.
Step 4: Completing the Quest and Unlocking the Sleep Sac
After successfully capturing the Barnos, return to Astera to complete the quest. As a reward, you’ll receive materials and unlock the ability to craft the Sleep Sac at the Crafting Bench. The Sleep Sac is a trap tool that induces sleep in monsters, making it easier to capture them in future hunts. This item is particularly useful for hunters aiming to complete capture-specific quests or farm specific monster materials.
By following these steps and completing "A Flash in the Pan," you’ll not only gain valuable experience but also unlock the Sleep Sac, enhancing your trapping capabilities in *Monster Hunter: World*.
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Gather Materials: Collect Sleep Herb, Poison Sac, and other required crafting materials for Sleep Sac
To gather the necessary materials for crafting a Sleep Sac in *Monster Hunter World*, you’ll need to focus on collecting Sleep Herbs, Poison Sacs, and other required crafting items. Start by locating Sleep Herbs, which are commonly found in the Ancient Forest and Wildspire Waste. These herbs glow faintly and are usually found in clusters near the ground. Look for them along the main paths or in areas with dense vegetation. You can also purchase Sleep Herbs from the Provisioner in Astera using Zenny, but gathering them yourself is more cost-effective.
Next, you’ll need Poison Sacs, which are obtained by carving monsters that inflict poison, such as Pukei-Pukei or Nargacuga. Focus on hunting these monsters and carving their bodies when they are downed or after they are defeated. Poison Sacs are not guaranteed drops, so you may need to hunt these monsters multiple times. Alternatively, you can purchase them from the Resource Center in Astera using Research Points, but hunting for them directly is more reliable.
In addition to Sleep Herbs and Poison Sacs, you’ll need other crafting materials like Monster Bone S and Earth Crystal. Monster Bone S can be obtained by carving small monsters like Jagras or Kestodon, or by breaking specific monster parts during hunts. Earth Crystals are commonly found in mining outcrops in the Ancient Forest and Wildspire Waste, so bring your Pickaxe and mine as many as you can while gathering Sleep Herbs.
To maximize efficiency, plan your gathering and hunting routes. For example, while farming Sleep Herbs in the Ancient Forest, take the time to mine for Earth Crystals and hunt small monsters for Monster Bone S. Similarly, when hunting Pukei-Pukei for Poison Sacs, focus on breaking its wings and neck for additional materials. This multi-tasking approach ensures you collect all required materials in fewer outings.
Finally, check your inventory regularly to ensure you have enough of each material before attempting to craft the Sleep Sac. If you’re missing any items, revisit the appropriate locations or hunts to gather what you need. Once you have all the materials, head to the Smithy in Astera or Seliana to craft your Sleep Sac, which is essential for crafting Sleep Ammunition or other sleep-inducing items in *Monster Hunter World*.
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Craft at Smithy: Use the Smithy to craft Sleep Sac with gathered materials in Monster Hunter World
In Monster Hunter World, the Sleep Sac is a useful item for crafting sleep-inducing ammunition and traps. One of the most straightforward ways to obtain a Sleep Sac is by crafting it at the Smithy using gathered materials. To begin the crafting process, you'll need to ensure you have the required resources. The primary materials needed for crafting a Sleep Sac are Sleep Herb and Earth Crystal. Sleep Herbs can be found in various locations, such as the Ancient Forest and Wildspire Waste, often glowing softly in dimly lit areas. Earth Crystals, on the other hand, are commonly obtained by mining nodes in the Ancient Forest, Wildspire Waste, and other locales. Make sure to gather at least one of each before heading to the Smithy.
Once you have the necessary materials, visit the Smithy in Astera or Seliana. Interact with the Smithy and navigate to the "Crafting" menu. From here, select the "Ammo/Utility" category, as the Sleep Sac falls under utility items. Scroll through the list until you find the Sleep Sac option. If you have the required materials, the option will be available for crafting. Confirm the selection, and the Smithy will combine the Sleep Herb and Earth Crystal to create a Sleep Sac. This process is quick and does not require any additional resources like zeni, making it an accessible method for hunters of all ranks.
It's important to note that crafting at the Smithy is not the only way to obtain Sleep Sacs, but it is one of the most reliable methods. Alternatively, you can acquire them as quest rewards or by carving certain monsters, though these methods are less consistent. Crafting ensures you can produce Sleep Sacs whenever needed, provided you have the materials. Additionally, as you progress in the game, you may unlock the ability to craft Sleep Sac+, an upgraded version requiring more advanced materials like Glow Herb and Fire Cell. However, for early to mid-game needs, the standard Sleep Sac crafted at the Smithy will suffice.
To optimize your material gathering for crafting Sleep Sacs, consider using a Gathering Set with skills like Geologist and Botanist to increase your chances of obtaining Earth Crystals and Sleep Herbs. These skills reduce the chances of depleting gathering nodes and increase the quantity of items obtained. Pairing this with a Palico equipped with the Plunderblade gadget can further enhance your material collection efficiency. By streamlining your gathering process, you'll always have the necessary materials on hand to craft Sleep Sacs at the Smithy.
Finally, remember that Sleep Sacs are essential for creating Sleep Ammo and Sleep Bombs, which are invaluable tools for trapping and capturing monsters. Crafting them at the Smithy ensures you’re always prepared for hunts that require capturing targets rather than slaying them. Keep a steady supply of Sleep Herbs and Earth Crystals in your inventory, and you’ll never find yourself lacking Sleep Sacs when you need them most. Mastering this crafting process is a small but significant step toward becoming a more efficient and prepared hunter in Monster Hunter World.
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Use in Combat: Equip Sleep Sac to induce sleep in monsters for easier hunting
In Monster Hunter World, the Sleep Sac is a valuable item that can significantly aid hunters in combat by inducing sleep in monsters, making them easier to hunt. To use the Sleep Sac effectively, you must first acquire it through specific means, such as crafting or obtaining it from certain quests and rewards. Once in your inventory, equip the Sleep Sac in your item bar for quick access during battles. The primary strategy is to throw the Sleep Sac at the monster when it is in a vulnerable state, such as when it is tired, eating, or recovering from a previous attack. Timing is crucial, as the monster must be in a position to inhale the powder from the Sleep Sac to fall asleep.
When the monster inhales the Sleep Sac's powder, it will gradually become drowsy, indicated by yawning animations or slowed movements. Once fully asleep, the monster will lie down, providing a window of opportunity for hunters to deal massive damage or set traps. This is particularly useful for breaking specific parts of the monster or completing quest objectives without constant interruptions. It’s important to note that not all monsters react the same way to Sleep Sacs, and some may require multiple applications or have shorter sleep durations, so observe their behavior to optimize your strategy.
To maximize the effectiveness of the Sleep Sac, coordinate with your team if playing multiplayer. For example, one player can use the Sleep Sac while others prepare for a coordinated attack with high-damage weapons or elemental weaknesses. Additionally, combining Sleep Sacs with other status effects, such as paralysis or bombs, can create devastating combos that quickly incapacitate even the toughest monsters. Always ensure you have enough Sleep Sacs in your inventory, as they are consumable and cannot be reused once thrown.
Crafting Sleep Sacs requires specific materials, such as Sleep Herb and Poison Sac, which can be gathered from the environment or obtained as quest rewards. Familiarize yourself with the crafting process to maintain a steady supply for prolonged hunting sessions. Alternatively, purchasing Sleep Sacs from the Provisioner in Astera or Seliana is an option if you have sufficient research points. Proper inventory management is key, as carrying too many items can slow you down, but having enough Sleep Sacs can turn the tide of a difficult battle.
In combat, prioritize positioning and safety when using the Sleep Sac. Throw it from a safe distance to avoid retaliation, and be mindful of the monster’s attack patterns. If the monster is in an enclosed area, the powder is more likely to be inhaled, increasing the chances of success. Practice makes perfect, so experiment with different scenarios to understand the best moments to use the Sleep Sac. Mastering this technique can make hunting more efficient and less frustrating, especially against formidable foes.
Finally, remember that the Sleep Sac is just one tool in your arsenal. Combine it with other tactics, such as using environmental traps, exploiting monster weaknesses, and maintaining your gear, to become a more effective hunter. By integrating the Sleep Sac into your combat strategy, you’ll find that even the most challenging encounters become more manageable, allowing you to focus on the thrill of the hunt rather than the struggle of survival.
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Farm Ingredients: Farm specific monsters or areas to efficiently gather Sleep Sac components
To efficiently farm Sleep Sac components in *Monster Hunter: World*, focus on hunting specific monsters known to drop these materials. One of the primary sources is the Girros, a small, fanged wyvern found in the Ancient Forest and Wildspire Waste. Girros frequently drop Sleep Sacs when carved, and their tracks can be followed using the Scoutfly system. Hunting Girros in expeditions is ideal, as it allows you to farm them repeatedly without the pressure of a quest timer. Aim for their tail, as carving it guarantees a Sleep Sac. Additionally, capturing Girros instead of slaying them increases the chances of obtaining rare materials, including Sleep Sacs.
Another reliable source of Sleep Sacs is the Gajau, a small aquatic creature found in the Coral Highlands and Rotten Vale. Gajau can be captured using a net, and each capture yields materials like Sleep Sacs. These creatures are non-aggressive and can be found in groups near water sources, making them easy to farm. Bring a Capture Net and focus on areas like the Coral Highlands' Area 11 or the Rotten Vale's Area 13, where Gajau are abundant. Farming Gajau is particularly efficient because it requires minimal combat and can be done quickly in expeditions.
For players seeking a more challenging hunt, the Odogaron is another excellent target for Sleep Sacs. This large fanged wyvern, found in the Wildspire Waste and Elder's Recess, drops Sleep Sacs when carved. While Odogaron is a tougher opponent, its quests often reward multiple Sleep Sacs upon completion. Focus on breaking its tail, as this part yields the highest chance of obtaining Sleep Sacs. Hunting Odogaron in investigations with gold rewards increases the likelihood of obtaining rare materials, making it a worthwhile investment of time.
Lastly, consider farming Bnahabra in the Ancient Forest for Sleep Sacs. These small flying insects can be found in Areas 8 and 13, often near walls or ceilings. Bnahabra drop Sleep Sacs when carved, and their low health makes them easy to farm in large numbers. Use a weapon with wide sweeps or area-of-effect attacks to maximize efficiency. While Bnahabra yield fewer Sleep Sacs per hunt compared to Girros or Odogaron, their ease of farming makes them a viable option for players looking to gather materials quickly.
By targeting these specific monsters and areas, you can efficiently gather Sleep Sac components in *Monster Hunter: World*. Combine these farming strategies with expeditions and investigations to maximize your yield and minimize time spent grinding. Always bring gathering tools like the Capture Net and prioritize carving or capturing monsters for the best results.
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Frequently asked questions
A Sleep Sac is a crafting material obtained by carving monsters that are asleep. It is primarily used to craft Sleep Coatings, which can be applied to weapons to inflict the sleep status on monsters, making it easier to capture them or deal damage while they’re vulnerable.
To get a Sleep Sac, you need to carve a monster while it is asleep. Use Sleep Ammo or Sleep Weapons to induce sleep, then carve the monster once it’s in the sleeping state. The drop rate is relatively low, so multiple attempts may be needed.
Small monsters like Jagras, Kestodon, and Girros are good targets for farming Sleep Sacs because they are easier to put to sleep and have a higher chance of dropping the material when carved while asleep.
Yes, you can increase your chances by using the Geologist skill (to prevent material breakage) and the Luck skill (to increase rare item drop rates). Additionally, carving while the monster is still asleep and using a Capture Master skill can slightly improve drop rates.











































