Growth of fungus: Researchers in 2021 found a species of Malassezia fungus in hair follicles. This fungus can result in skin conditions such as seborrheic dermatitis. Hair being wet for long periods, such as overnight, may increase the risk of these conditions developing.
It turns out letting your hair air dry after you've washed it is causing more damage than you think. According to Dr Tim Moore (the Australian Vice President of Smart Devices) leaving your hair wet for extended periods of time is putting excessive pressure on your strands resulting in split ends.
"Simply put, hair is at its most vulnerable when wet. Sleeping with wet hair can lead to a host of problems for the scalp: unwanted bacteria, fungal infections, skin irritation, itchiness, dryness, redness, and dandruff," says hairstylist Miko Branch, co-founder of hair care brand Miss Jessie's.
Drying your hair after a shower may seem like a simple task. However, it's a crucial step in maintaining the health and appearance of your hair. After showering, your wet hair is in a fragile condition. It becomes more vulnerable to breakages and other damages.
And when you don't get enough air flowing around your strands, it remains wet much longer than it would if it were drying during the day. That damp environment can lead to the formation of mildew and bacteria on your hair, he explains, which could then lead to itchiness on the scalp and even a noticeable odor.
When your hair is wet, it's more fragile and prone to breakage, says Jasmine Burnside, a hairstylist in New York City. "Going to bed with wet or damp hair will most likely lead to more friction on the strands, ultimately leading to potential damage." That's why she says it's something that she advises against.
1. So, first, let your wet hair air dry until its at least damp (or if you need to go to bed, like, yesterday, use a hair dryer to quickly get some of the moisture out). 2. Next, unless you want to wake up to a specific style, sleep with your hair down so it can move freely while you toss and turn.
The best way to dry your hair is to let it air dry under the fan as much as possible. However, some experts believe combining air and blow-drying is healthier than just air drying. It is good to let your hair air-dry seventy percent of the way and then blow-dry till they become dry ultimately.
By not drying hair at all after a shower, the water droplets stay in your hair, which makes your hair swell up. This swelling causes damage to the proteins that make up the structure of your hair. When these proteins are impacted, your hair looks and feels rough (cue frizz).
After leaving the shower, start by dabbing off excess water with a microfibre cloth. Avoid rubbing the hair vigorously, as the friction causes the strands to tangle and generate frizz. Then, keep your hair wrapped for 10 to 15 minutes.
Usually, it takes an hour or two for damp hair to dry completely. However, this time may vary depending on the hair length and porosity. Highly porous hair can take an entire day to dry. It's because porous hair quickly soaks water and takes longer to dry.
Hair can often become dehydrated in cold weather, but air-drying, as opposed to heat styling, can help your hair retain moisture better. Air-drying depletes your hair of moisture over a longer period whereas blow-drying depletes your hair of moisture quickly. You lose more moisture with a quick blow-dry.
While excessive heat can cause damage to the surface layer of the hair, air-drying can cause trauma to that inner lipid layer, which will make your strands weaker as a result. Over time, something called hygral fatigue happens, i.e. repeated swelling of the hair.
When used timely and moderately, blow drying is better for scalp and hair. Air drying (like over washing) over an extended period can cause scalp to compensate, over produce oil leaving hair more oily, and causing you to fight the imbalance with more and more shampoo for oily scalp and hair.
Damaged hair is when your hair feels matted or spongey when wet. In extreme cases you may have hair loss. Dry hair needs moisture while damaged hair needs protein.
Use a silk scarf or cloth and tie it like a hairband to make sure your hair does not touch the pillowcase. Once you wake up, flip your hair upside down, gently separate the hair and flip it back up. Resist the urge to brush your hair, as it causes more friction and frizz,” recommends Sabanayagam.
"Certain bacteria and fungi thrive in warm, moist environments and so will proliferate on scalp skin if it stays damp for hours," explains Washington, D.C.-based board-certified dermatologist Noëlle Sherber.