Hot Shower Before Bed: Why It Helps Sleep and When to Have It

A hot shower before bed is one of the few sleep tips with a clear physical reason behind it, not just a feeling of relaxation. Warming your body, then letting it cool, appears to help you fall asleep a little faster. The catch is timing: too close to bed or too hot on a summer night, and it can work against you. This guide covers why a warm shower helps, what the research found, the best timing and temperature, showers versus baths, and when a cool shower is the better call.

The short answer: a warm shower or bath about one to two hours before bed can help you fall asleep faster and sleep a little better. It works because warming your skin draws blood to your hands and feet, which then helps your core temperature drop, part of the body's normal run-up to sleep. A meta-analysis found water around 40 to 42.5°C, for as little as 10 minutes, one to two hours before bed, shortened the time it took to fall asleep. A longer bath seems to work better than a quick shower. On hot nights, a cool shower closer to bedtime makes more sense.

Why a warm shower helps you sleep

Your core body temperature naturally falls in the evening and through the night. The Sleep Health Foundation explains that as you fall asleep, your core temperature drops, reaching a low point around 3 to 5am, and that the temperature of your hands and feet is particularly important for sleep (source).

A warm shower nudges that process along. Heat on your skin opens up blood vessels near the surface, especially in your hands and feet. After you get out, that extra blood flow lets heat escape, and your core temperature drops faster than it otherwise would. That drop is one of the signals your body associates with sleep. The same idea is behind wearing socks to bed.

There's a simpler benefit too. A shower is a clear break between the day and bedtime, and both the Sleep Health Foundation and Better Health Channel list a warm bath among relaxing things to do before sleep (source).

What the research found

The meta-analysis. A 2019 systematic review and meta-analysis in Sleep Medicine Reviews by Haghayegh and colleagues pulled together 17 studies of warm showers and baths before bed. Bathing at 40 to 42.5°C was linked with better self-rated sleep quality and sleep efficiency, and when it was done one to two hours before bedtime, for as little as 10 minutes, people fell asleep significantly faster. The authors said more research was needed, especially on the best timing and duration.

Shower versus bath. A 2023 study of 23 healthy adults compared a shower, a short bath (about 5 minutes) and a long bath (about 16 minutes), all at around 40°C and taken 1.5 to 2 hours before bed. The long bath raised body temperature the most and produced the biggest drop before sleep. People fell asleep in about 12 minutes after the long bath, compared with about 20 minutes after a shower, and rated their sleep better (source).

So a shower helps less than a proper soak, but the principle is the same: warm up, then cool down.

Timing and temperature

Factor	What the research suggests
When	About 1 to 2 hours before you plan to sleep
How hot	Warm to hot, around 40°C. Comfortable, never scalding
How long	At least 10 minutes. Longer warms you more
Shower or bath	A bath warms you more. A long, warm shower is the next best
Afterwards	Let your body cool in a comfortable room. Don't bundle up straight away

A few practical points:

• Too close to bed can backfire. Jumping into bed while still hot means your body hasn't had time to cool. If you can only shower right before bed, keep it shorter and less hot.
• Check the water, especially for children and older people. Hot tap water can scald, so set a comfortable temperature rather than the hottest you can stand.
• Stand up slowly after a long, hot soak if you feel light-headed.

Hot nights: go cool instead

In an Australian summer, the last thing you need is extra heat. The Sleep Health Foundation suggests having a cool shower before bed on hot nights, and another if you wake and can't get back to sleep (source). When the bedroom is already warm, cooling yourself down directly is more useful than warming up first. See hot weather sleep tips and best bedroom temperature for sleep.

Cold plunges right before bed are a different story. A very cold shower can be stimulating, which is why many people use one to wake up. See cold showers in the morning.

Building it into your routine

1. Pick a fixed time, roughly 90 minutes before your usual bedtime.
2. Shower or bathe for 10 to 15 minutes in warm water.
3. Dry off and dress lightly, then do something calm: read, stretch, get things ready for tomorrow.
4. Keep lights low and screens away from the bed. See bedtime routine for adults.
5. Get into bed when you feel sleepy, not just because the clock says so.

A warm shower is a helper, not a cure. If you've had trouble sleeping most nights for weeks, see insomnia: what helps.

When to see your GP

See your GP if you regularly take more than half an hour to fall asleep, wake often, or feel exhausted during the day despite good habits. If you have heart or blood pressure problems, are pregnant, or get dizzy in hot water, check with your GP before taking long hot baths. This guide is general information, not medical advice.

Where the Sovune Nudge fits

We make the Sovune Nudge, a silent vibrating wristband alarm, so we're not neutral. It won't change how you fall asleep, but it fits into a calm, low-tech evening routine and a gentle start the next morning.

• Set on the band itself. No app, no phone, no Bluetooth, so your phone can stay out of the bedroom.
• Water-resistant for everyday use, so showers are fine. Not swimming or diving.
• Wakes you with vibration on your wrist, starting as a gentle tap and building through three intensity levels.
• Up to 14 days of nightly use per charge, rechargeable via USB.

It comes with a 30-day money-back guarantee.

Quick answers

Is a hot shower before bed good for sleep? For most people, yes, if it's one to two hours before bed. It helps your core temperature fall, which can help you fall asleep faster.

How long before bed should I shower? About one to two hours. That gives your body time to cool down afterwards.

Is a bath better than a shower for sleep? A longer bath warms you more, and one study found people fell asleep faster after a 16-minute bath than after a shower.

Should I have a cold shower before bed in summer? On hot nights, a cool shower is usually more helpful. Very cold water can be stimulating, so lukewarm to cool is a good middle ground.

For every type of silent alarm compared, see our complete guide to vibrating alarms in Australia.

See the Sovune Nudge →