Herbie Murray
Sleep is divided into four types: NREM stages 1, 2, 3, and REM. These types of sleep have different stages with unique purposes for our health. A full sleep cycle of all four stages is documented to take around 90 minutes. If you have to choose between sleeping for a couple of hours or not sleeping at all, you should choose to sleep. Just 90 minutes gives your body enough time to complete one sleep cycle, of which you typically complete 4 to 6 nightly.
| Characteristics | Values |
|---|---|
| Recommended sleep time | 7-8 hours |
| Sleep cycle duration | 90 minutes |
| Benefits of 90 minutes of sleep | Completing one sleep cycle, feeling more alert, minimizing grogginess |
| Drawbacks of 90 minutes of sleep | Waking up during REM sleep can cause tiredness throughout the day |
| Alternatives to 90 minutes of sleep | 15-20 minute power naps, 2-hour increments |
| Risks of sleep deprivation | Poor judgment, cognitive impairment, high blood pressure, heart issues, diabetes, stroke, risk of accidents |
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What You'll Learn
Sleep pressure and tiredness
Sleep pressure is the body's need for sleep, which increases the longer you stay awake. It is influenced by two main processes: the circadian process, which is the body's internal clock, and the sleep drive process, which is the body's need for sleep that increases the longer you stay awake.
The body's sleep pressure increases during the day, peaking in the evening when it's time to sleep. It then decreases during sleep, reaching its lowest point in the morning when you wake up. This is why you may feel tired in the evening and awake in the morning.
The body's sleep pressure is also influenced by the amount of sleep an individual gets. If you don't get enough sleep, your body's sleep pressure will be higher, and you will feel more tired. This is why people feel sleepier when they have not had enough sleep the night before.
A sleep cycle typically lasts 90 minutes and consists of four stages: NREM 1 (N1), N2, N3, and REM. N1 is a very light sleep that occurs when you first lie down. Your muscles relax and twitch, and your breathing and heart rate slow down. N2 is a deeper sleep, and N3 is an even deeper sleep where your body repairs and grows. REM sleep is when your brain is most active, and it is important for learning and memory. During REM sleep, your brain consolidates information from the day and forms memories. This is also the stage where you dream.
Completing a full sleep cycle is important for feeling rested and minimizing grogginess when you wake up. If you wake up during REM sleep, you may feel tired throughout the day. This is why 90 minutes of sleep is better than 60 minutes, as it allows the body to complete a full sleep cycle.
However, it's important to note that the 90-minute sleep cycle is just an approximation, and individual cycles can vary from 60 to 120 minutes. Additionally, the depth of sleep also matters, as the cycles become less deep as the night progresses. Therefore, while 90 minutes of sleep is better than no sleep, it is not a substitute for a full night's rest of 7-8 hours.
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Sleep cycles and REM sleep
Sleep is a body process that allows the body to rest, repair and restore itself. Sleep cycles and REM sleep are important components of sleep. Sleep cycles refer to the stages of sleep that a person goes through during a night's rest. Typically, a person completes four to six sleep cycles nightly, each lasting between 90 and 120 minutes.
The sleep cycle consists of four stages, three of which are non-rapid eye movement (NREM) sleep, and the fourth is rapid eye movement (REM) sleep. The first stage of the sleep cycle is NREM 1 (N1), which is a very light sleep. Our muscles relax and may twitch, and our breathing and heart rate slow down. This phase may last for 5 to 10 minutes.
The second stage is NREM 2, which is a light sleep but deeper than N1. The heart rate and body temperature decrease further, and the body prepares for deep sleep. This stage can last for 10 to 25 minutes.
The third stage is NREM 3, which is deep sleep. It is difficult to wake someone up during this stage, and if they do wake up, they may experience sleep inertia, a state of confusion or mental fog that can last about 30 minutes.
After the three stages of NREM sleep, the body moves into the REM stage. REM sleep usually occurs 90 minutes after falling asleep. This stage is characterised by rapid eye movements, and it is when most dreams occur. The brain activity during REM sleep is similar to that during wakefulness, and it is important for learning and memory consolidation. The first period of REM sleep is typically the shortest, around 10 minutes, and it gets longer with each cycle.
Completing a full sleep cycle is important to minimise grogginess and improve cognitive performance. If you have to choose between getting very little sleep and no sleep at all, it is better to opt for some sleep, even if it is just 90 minutes, as this allows your body to complete one full sleep cycle.
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Sleep deprivation and health risks
Sleep is a fundamental human need, and insufficient sleep can have detrimental effects on one's health and well-being. Sleep deprivation can lead to a range of health risks, and even a small amount of sleep can be beneficial to mitigate these risks.
A sleep cycle typically lasts around 90 minutes and consists of four stages: N1, N2, N3, and REM. N1 is the lightest stage of sleep, where our muscles relax and our breathing and heart rate slow down. N2 is a deeper stage of sleep, and N3 is the deepest stage, where the body repairs and grows. REM sleep is when rapid eye movement occurs, and it is associated with dreaming. A person usually completes four to six sleep cycles per night.
Not getting enough sleep can negatively impact cognitive abilities and judgment. Sleep deprivation can put individuals at risk of making poor decisions, such as driving when they are not mentally alert. It can also lead to serious health issues such as high blood pressure, heart problems, diabetes, and an increased risk of stroke. Additionally, a lack of deep sleep has been linked to an increased risk of Alzheimer's disease and cancer.
While 90 minutes of sleep is not a substitute for a full night's rest, it can provide some benefits. If an individual is faced with the choice between sleeping for 90 minutes or not sleeping at all, it is generally recommended to opt for the former. 90 minutes of sleep allows the body to complete one full sleep cycle, which can help minimize grogginess upon waking and provide some restorative benefits.
However, it is important to prioritize getting sufficient sleep overall. When possible, aim for 7 to 8 hours of sleep per night to ensure you are getting enough deep sleep and completing multiple sleep cycles. This will help reduce the health risks associated with sleep deprivation and promote optimal physical and mental well-being.
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Sleep hygiene and habits
Sleep is essential for both physical and mental health, improving productivity and overall quality of life. Sleep hygiene and habits are a set of practices and routines that help you get better sleep. Here are some tips to improve your sleep hygiene and habits:
Bedroom Environment
Your bedroom environment should be optimized for sleep. This includes minimizing noise and light disruptions with the use of heavy curtains, rugs, and light-blocking shades. Maintain a slightly cool temperature in the room as most people sleep better in a cool environment. Ensure your mattress and pillows are comfortable and not worn out.
Sleep Schedule
Maintain a consistent sleep schedule by going to bed and waking up at the same time every day, including weekends. Having a fixed wake-up time helps you get into a rhythm of consistent sleep. If you need to nap during the day, aim for 30 minutes or less and avoid long or late afternoon naps, as they can interfere with your nighttime sleep.
Pre-Bed Routine
Develop a relaxing pre-bed routine to signal to your body that it's time to wind down. Avoid stressful and stimulating activities, and put away electronic devices at least an hour before bedtime. Consume your evening meal at least three hours before bedtime, and avoid alcohol and caffeine close to bedtime as they can interfere with your sleep.
Daily Habits
Form healthy daily habits that promote better sleep. Avoid nicotine and smoking, as nicotine is a stimulant that can interfere with nighttime sleep. Reduce your screen time, especially before bed, as the blue light from electronic devices can disrupt your sleep. Engage in relaxing activities such as listening to calming music or practicing guided relaxation techniques.
Sleep Cycle Awareness
Understand your sleep cycles, which typically last around 90 minutes each. Aim for sleep durations that allow you to complete full sleep cycles (e.g., 90, 180, or 270 minutes) to minimize grogginess when you wake up. If you can't sleep for a full 90 minutes, consider a short power nap of 15-20 minutes instead.
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Power naps and alertness
A good night's sleep is essential for overall health and well-being. However, sometimes, due to various reasons, we may find ourselves facing a choice between getting very little sleep and getting none at all. In such situations, it is always better to opt for some sleep, even if it's just a quick power nap.
A power nap, typically ranging from 15 to 20 minutes, can be an effective way to boost alertness and productivity during the day. It can be especially beneficial when you're feeling sleepy, such as after a heavy meal or during an afternoon slump. Power napping for a short duration allows you to rest without entering deep sleep, making it easier to wake up and feel refreshed.
Completing a full sleep cycle is essential for optimal rest. On average, a full sleep cycle, consisting of all four stages, takes around 90 minutes. The cycle includes NREM 1 (N1), N2, N3, N2, and REM sleep, with each stage serving a unique purpose. Waking up during REM sleep, which typically occurs around the 90-minute mark, can leave you feeling groggy and tired throughout the day. Therefore, aiming for a 90-minute nap ensures you complete one full sleep cycle, allowing you to wake up more refreshed and alert.
However, it's important to note that individual sleep needs may vary. While 90 minutes of sleep can provide a quick energy boost, it is not a substitute for a full night's rest. Regularly missing out on sufficient sleep can lead to sleep deprivation, negatively impacting your judgment, cognitive abilities, and overall health. Therefore, while power naps and 90-minute naps can be helpful in a pinch, prioritizing consistent and adequate sleep is crucial for maintaining optimal alertness and well-being.
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Frequently asked questions
Yes, 90 minutes of sleep is better than no sleep at all. This duration gives your body enough time to complete one full sleep cycle, which can reduce grogginess when you wake up.
A sleep cycle refers to the progression through different stages of sleep, from light sleep to deep sleep and REM sleep. A full sleep cycle of all four stages typically takes around 90 minutes.
If you don't get enough deep sleep, you may be more prone to physical and mental health issues, such as high blood pressure, heart problems, diabetes, or stroke. Deep sleep is also important for tissue growth and repair, immune system function, and memory consolidation.
The amount of sleep needed varies across a lifespan and from person to person. However, young adults generally need seven to nine hours, while older adults need seven to eight hours of sleep.
If you're having trouble sleeping, it's important to practice good sleep hygiene. This includes refraining from using electronic devices before bedtime, exercising regularly, and eating a balanced diet. You can also establish regular sleep-wake habits and ensure your sleeping environment is quiet and comfortable.
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