Gina Johnson
Sleeping with wet hair is not recommended due to the potential damage it can cause to the hair and scalp. The hair is at its weakest when wet, making it more prone to breakage from the friction of tossing and turning against a pillow. Wet hair can also encourage bacterial and fungal growth, leading to scalp issues such as dandruff, dermatitis, and folliculitis. While the risks are minimal, sleeping with wet hair can result in bedhead, tangles, and a funky mane, requiring extra care to style in the morning. To mitigate these issues, it is advisable to dry hair before bed, either by air-drying or using a hairdryer, and sleeping on a silk pillowcase to reduce friction and breakage.
| Characteristics | Values |
|---|---|
| Hair health | Increased fragility, prone to breakage, split ends, bedhead, frizz, knots, and tangles |
| Scalp health | Bacteria and yeast growth, dandruff, dermatitis, acne, scalp infections, fungal infections, itchiness, dryness, redness |
| Pillow health | Fungal growth, bacterial buildup |
| Other | Susceptible to catching a cold (according to folklore) |
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Hair breakage
Wet hair is more fragile and prone to breakage than dry hair. The water weakens the hair's protein structure, making it more elastic and easier to stretch and snap. This is why you may notice more hair in your brush or on your pillow after sleeping with wet hair. The friction caused by hair rubbing against the pillow can also cause it to break or develop split ends more easily.
Chemically treated hair is more fragile and prone to breakage. Each strand of hair is naturally protected by a layer of brittle scale-like cells called the cuticle. When wet, your hair soaks up water and swells, causing these flaps to stand up, making hair vulnerable to damage.
The added friction from sleeping on a pillow with wet hair may also make things worse, pulling some strands of hair farther than their elasticity allows, leading to breakage.
There is also a risk of fungal growth when sleeping with wet hair. Fungi can get into the hair and scalp, making hair weaker and more prone to breakage.
To reduce the risk of hair breakage when sleeping with wet hair, you can:
- Use a silk or satin pillowcase to reduce friction.
- Apply a leave-in conditioner or hair oil to help nourish and protect your hair.
- Wear a hair cap or scarf to ease friction between your hair and your pillow.
- Detangle your hair before going to sleep to avoid extra stress on your hair.
- Partially air dry or blow-dry your hair before bed to reduce its moisture content.
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Skin infections
Sleeping with wet hair can increase your risk of developing skin infections, particularly on your scalp. This is because certain bacteria and fungi thrive in warm, moist environments, and your wet pillow and scalp provide the ideal breeding ground for these microorganisms to proliferate.
One type of yeast called Malassezia can accumulate on the scalp and cause flaking, which can be mistaken for dandruff. Malassezia has also been linked to a skin disease called seborrheic dermatitis, which can cause oily and yellow patches of skin on the face and head. Another fungal infection you are at risk of developing when sleeping with wet hair is scalp ringworm, which can cause an itchy, ring-shaped rash and even result in bald spots.
Additionally, wet hair can increase your risk of developing acne. While there is no direct evidence that sleeping with wet hair causes acne, pillows can become a breeding ground for bacteria due to excess moisture, potentially worsening acne by creating a humid and oily environment that leads to clogged pores and inflammation.
To reduce the risk of skin infections, it is recommended to sleep with dry hair whenever possible. If you must sleep with wet hair, using a silk pillowcase or a microfibre towel can help minimise the amount of moisture retained, reducing the risk of bacterial and fungal growth.
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Scalp issues
Sleeping with wet hair can lead to several scalp issues. Firstly, a damp scalp for extended periods can create an environment conducive to fungal and bacterial growth, leading to problems such as dandruff, seborrheic dermatitis, or fungal folliculitis. The warm, moist environment encourages the proliferation of certain bacteria and fungi, such as Malassezia, which can cause flaking and itching. Additionally, the pillowcase itself can become a breeding ground for bacteria and fungi, which can then transfer back to the scalp, causing or exacerbating infections.
The increased sweat and sebum production while sleeping with wet hair can disrupt the scalp's microbiome, hindering hair follicle health. This disruption, combined with product buildup and yeast, can further contribute to scalp issues. Furthermore, the structural integrity of hair weakens when wet, making it more prone to breakage and developing split ends due to friction with the pillow.
To mitigate these issues, it is recommended to partially air dry hair or use a hairdryer on a cool setting before sleeping. Using a microfiber towel or t-shirt to gently blot the hair can also help minimize friction and breakage. Sleeping on silk pillowcases or scarves is preferable as they create less friction, reducing the chances of pulling, tangling, and breakage. While sleeping with wet hair may not cause severe health issues, it is advisable to avoid making it a frequent habit to maintain scalp and hair health.
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Pillowcases and fungi
Pillowcases are a hotbed for fungi, and a wet pillowcase and pillow provide the ideal breeding ground for fungi to grow. Fungi, such as Malassezia, can lead to conditions like dandruff or dermatitis. Aspergillus fumigatus, another common species of fungus found on pillows, can cause severe infections in people with weakened immune systems and worsen asthma symptoms.
When you sleep with wet hair, the moisture from your hair can transfer to your pillowcase, creating a warm, moist environment that encourages fungal growth. This fungus can then come into contact with your scalp and hair, potentially leading to infections and other issues.
To reduce the risk of fungal growth on your pillowcase, it is recommended to avoid sleeping with wet hair. If you must sleep with damp hair, using a silk or satin pillowcase can help reduce friction and minimize the risk of hair breakage. These types of pillowcases create less friction with the hair than cotton pillowcases, which may decrease the risk of hair damage. Additionally, blotting your hair with a microfiber towel or t-shirt before bed can help remove excess moisture, reducing the potential for fungal growth.
Regularly changing and washing your pillowcases can also help prevent the buildup of fungi and bacteria. Dermatologists recommend changing your pillowcase at least once a week and ensuring your hair and scalp are clean and dry before bedtime.
By following these simple steps, you can help reduce the risk of fungal growth on your pillowcase and maintain healthy hair and scalp.
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Hair drying tips
Sleeping with wet hair is generally not recommended due to the potential risks to your hair and scalp health. Wet hair is more fragile and prone to breakage, and can also cause scalp issues such as dandruff and infections. Here are some tips to help you dry your hair effectively before bed:
Towel Drying
Use a microfiber towel or a t-shirt to gently blot your hair after washing. These materials are softer than traditional towels and can help minimise friction and breakage. Avoid rubbing your hair vigorously, as this can cause tangles and damage.
Air Drying
If you have time, let your hair air-dry partially or until it is slightly damp before sleeping. This reduces the amount of moisture in your hair and decreases the risk of breakage. You can also try the "curly plop" method if you have curly hair. Simply wrap your hair in a microfiber bonnet or a cotton t-shirt to absorb excess moisture while you sleep.
Blow Drying
If you choose to use a hairdryer, it is recommended to towel dry your hair first until it is about 90% dry. Then, use the hairdryer on a cool or warm setting to avoid heat damage. Avoid using high heat, as this can contribute to premature hair breakage.
Hair Products
Certain hair products can help reduce friction and make hair easier to manage. For example, conditioner helps seal the hair cuticle and make hair easier to detangle. Leave-in conditioners or curl prep creams can act as detanglers and conditioning treatments. Additionally, amino acid hair treatments can help you wake up with shiny, frizz-free, and manageable hair.
Pillowcases
The type of pillowcase you use can also make a difference. Silk pillowcases are recommended as they allow your hair to slide smoothly, reducing friction and tangling. Cotton pillowcases, on the other hand, can be rough on your hair and increase friction, leading to breakage.
Hairstyles
If you have highly textured hair, you can try twisting your damp hair into gentle twists and securing them with elastics. In the morning, remove the elastics and gently shake your hair to release your natural curls. For straight hair, consider using a boar bristle brush to distribute products evenly and achieve shiny, frizz-free hair.
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Frequently asked questions
While it will not cause any diseases or permanent damage, sleeping with wet hair can lead to hair breakage and skin infections. The hair is at its weakest when wet, and the friction caused by tossing and turning can cause hair to break or develop split ends. The warm, damp environment can also encourage bacteria and yeast growth, which can lead to scalp issues such as dandruff, seborrheic dermatitis, and acne.
If you can't avoid sleeping with wet hair, it is recommended to leave your hair down and use a microfiber towel or t-shirt to gently blot your hair after washing. You can also let your hair air dry partially before going to sleep, or use a hair dryer on a cool setting to reduce moisture. Silk pillowcases are also preferable to cotton pillowcases as they create less friction, reducing the chances of hair breakage.
Sleeping with wet hair can save time and effort by skipping the hair-drying process. It can also be beneficial for those with curly hair as the increased elasticity can make hair less prone to breakage.
