Is It Bad to Sleep With Wet Hair? Experts Weigh In on the Common Habit

From an itchy, flaky scalp to frizz and split ends, the side effects of hitting the pillow with damp strands can quickly add up. Thankfully, a few simple tweaks to your nighttime routine can help keep your hair healthy.

Nothing quite beats climbing into bed feeling fresh and clean after a long day and a nice, warm shower. You've probably even slipped under the covers with wet hair to squeeze in a few extra minutes of sleep without bothering to let it dry — but have you ever stopped to consider how that might affect the health of your luscious locks?

A young woman looking at her hair in a mirror | Source: Getty Images

While dozing off with damp hair once in a while isn't a trainsmash, turning it into a nightly habit can cause more problems than you might realize, according to Anna Chacon, M.D., a board-certified dermatologist based in Miami, Florida.

The lingering moisture can potentially lead to scalp health issues like irritation, odor, and dandruff, as well as hair damage, which is why experts generally advise against going to bed with wet hair.

Resting your head on a pillow with damp hair means the fabric holds moisture against your scalp, leaving it with nowhere to evaporate. It's the reason your hair can still feel slightly damp when you wake up, even nine hours after your shower.

A woman lying in bed and texting after a shower | Source: Getty Images

"Damp environments are breeding grounds for microbes, including bacteria and yeast," Brendan Camp, M.D., a board-certified dermatologist, said.

Besides leaving you itchy from an imbalanced skin microbiome, Dr. Camp noted that it could also cause a musty smell. That same imbalance can play a part in dandruff as well.

According to Dr. Chacon, ongoing moisture can throw off your scalp's natural equilibrium, leaving it dry and flaky. Factor in that many pillowcases harbor dirt, oil, bacteria, and even fungi, and it's no surprise that wet hair often goes hand in hand with a flaky scalp.

A woman with an irritated scalp | Source: Getty Images

"[...] Going to bed with wet hair can also contribute to the development of fungal infections on your scalp," Dr. Chacon said. "This is due to the moist environment that can be created, which is a perfect breeding ground for fungi."

On top of all that, wet hair breaks more easily. Going to sleep with a damp mane makes it more vulnerable to damage like split ends and frizz, particularly if you toss and turn on cotton pillows.

"Wet hair strands are much more fragile than dry hair strands," explained Dr. Michele Green, a board-certified cosmetic dermatologist in New York City. "When the hair is wet, it becomes more elastic, and the protein structure is weakened, making it more fragile and susceptible to breakage."

A woman assessing her hair breakage after brushing | Source: Getty Images

If you can't avoid going to bed with wet hair, there are ways to counteract the consequences. Here are a few tips worth following:

1. After washing, gently pat (rather than rub) your hair with a microfiber towel or T-shirt to soak up excess water. Both are gentler than a regular towel and can help cut down on friction and breakage.
2. Avoid hitting the pillow with dripping-wet hair. Let it partially air dry first, or reduce the moisture with a blow-dryer on a cool setting. (Frequent heat styling can also lead to early breakage, which is why it's best to skip the high heat.)
3. Place a clean towel over your pillow. "The extra layer may help absorb excess moisture," Camp explained, especially if you lie back with your hair draped over the towel so evaporation can do its thing.
4. Think about swapping in a silk or satin pillowcase. Their smooth surfaces cause less friction than cotton, helping to protect your strands from snapping.
5. Wear your hair up. Leaving it loose can make it knot and rub against your pillowcase, which only adds to the damage. "I recommend loosely braiding your hair or tying it in a loose bun to limit the amount of friction," Chacon said.

A woman drying her hair after a shower | Source: Getty Images

While the occasional night with damp hair isn't cause for alarm, making a habit of it could leave both your scalp and strands paying the price.

With a little extra drying time and a few smart swaps, such as a silk pillowcase or a loose braid, you can still enjoy that post-shower comfort without waking up to frizz, flakes, or breakage. Alternatively, you can check out dry shampoo.