Is It Bad to Sleep With Wet Hair? Colds, Breakage and What to Do

Sleeping with wet hair isn't dangerous, and it won't give you a cold. Colds are caused by viruses, not by a damp head. The real downsides are cosmetic: wet hair is more fragile, so a night of rubbing against a pillow can mean more tangles, frizz and breakage. If you can, dry your roots first or shower a little earlier in the evening.

So it's not "bad" in a health sense for most people. It's mostly a hair-care trade-off.

Can you get sick from sleeping with wet hair?

No. A cold comes from catching a virus, not from going to bed with damp hair. The CDC says more than 200 respiratory viruses can cause colds, with rhinoviruses the most common, and that they spread mainly through droplets when an infected person coughs or sneezes, and through close contact.

That means the old warning gets the cause wrong. If you wake up with a sore throat after a wet-hair night, you most likely picked up the virus from someone a day or two earlier. Feeling chilly is uncomfortable, but being cold isn't how the virus gets in.

If you are already sick, sleep matters more than your hair. The guide on how much sleep you need when you're sick covers that.

Is sleeping with wet hair bad for your hair?

It can be, a little. The American Academy of Dermatology notes that hair is delicate when it's wet, which is why dermatologists suggest a wide-tooth comb instead of a brush on wet hair and gentle towel-blotting instead of rubbing.

A pillow is basically eight hours of slow rubbing. With wet hair, that can lead to:

• Tangles and knots that are harder to work out in the morning
• Frizz and flattened or odd-shaped hair where it dried against the pillow
• More breakage, especially if you pull wet hair into a tight bun or ponytail, which the AAD also lists as a damaging habit

Thick, curly or long hair that takes hours to air dry tends to be the most affected. Short or fine hair often dries in an hour or two and may not show much difference at all.

Can sleeping with wet hair cause scalp problems?

There's little solid research on this, so be skeptical of scary claims. You'll often read that a damp scalp and pillow can encourage fungus, dandruff or bacteria. That's plausible in the sense that a pillow that stays damp night after night isn't ideal, but there isn't good evidence that an occasional wet-hair night causes a scalp condition.

Sensible precautions cost nothing: let your roots dry before you lie down, change or wash your pillowcase regularly, and don't sleep on a pillow that's still damp from the night before. If you have flaking, itching, redness or sores on your scalp, see a dermatologist rather than guessing at the cause.

How to sleep with wet hair (if you have to)

Get the roots as dry as you can and protect the lengths. Here's a quick routine that follows the AAD's gentle-handling advice.

1. Blot, don't rub. Wrap your hair in a towel or soft T-shirt for 10 minutes to soak up water.
2. Detangle gently with a wide-tooth comb, starting at the ends.
3. Dry the roots. A few minutes with a hair dryer on a low or cool setting gets the scalp dry without much heat on the lengths.
4. Keep it loose. A loose braid or a loose, low twist is gentler than a tight bun or ponytail.
5. Lay a dry towel over your pillow if your hair is still damp, so the pillow itself doesn't stay wet.
6. Wash pillowcases often, especially if wet-hair nights are a habit.

When should you shower before bed?

About 1 to 2 hours before bed gives your hair time to dry and may help you fall asleep faster. A 2019 review of 13 studies found that a warm shower or bath of 40 to 42.5 °C (104 to 108.5 °F), taken 1 to 2 hours before bedtime for as little as 10 minutes, was linked to falling asleep faster and better self-rated sleep quality. The warmth is thought to help your body shed heat afterward, and a dropping core temperature is part of how you get sleepy.

Here's what that looks like with a 10:30 PM bedtime:

The review authors noted the evidence is still limited, so treat this as a helpful nudge rather than a sleep cure. If you work out in the evening, the shower usually follows the workout; the guide on how long before bed to work out helps you set that timing. You can also fold the shower into a bedtime routine so it happens at the same time each night.

Is it OK to shower in the morning instead?

Yes. If your hair is long or slow to dry and you hate the morning frizz, a morning shower solves the problem completely. There's no health reason to prefer one over the other. Choose the one that fits your schedule, and if you shower at night, give yourself the 1 to 2 hour buffer.

Whatever you choose, enough sleep matters more than when you wash your hair. Use the sleep calculator to pick a bedtime that ends on a full sleep cycle, then plan your shower backward from there.