Do Warm Showers Help You Sleep? How Hot Baths Improve Rest
Do Warm Showers Help You Sleep? Understanding the Connection
Sleep is important for both your short-term and your long-term health. Your mood, memory, and energy levels are better when you’ve slept well. Sleep also decreases the risk of many serious health issues, including heart attacks, strokes, and diabetes.
Many people would like to get better sleep, but find that it’s sometimes challenging to fall asleep. In the US, more than 1 in 7 adults have trouble falling asleep every night or on most nights.
If you regularly get into bed and then find it tough to fall asleep, there’s a simple technique that may help. Research has shown that taking a hot shower or bath late in the evening can help you to fall asleep faster.
How Warm Showers Help You Sleep: The Science Explained
This technique works because it helps to align your body temperature with your natural circadian rhythm—the daily 24-hour rhythm that keeps you in sync with the sun. Every aspect of your body is affected by your circadian rhythm, from your brain activity to your metabolism to your body temperature. These all need to be aligned properly for you to fall asleep.
As you get closer to bedtime, your circadian rhythm triggers a natural drop in your body temperature. The change is not huge—only about a degree or two—but it’s important. This slight lowering of your body temperature is part of how your body gets prepared to shift into sleep mode.
When you take a hot shower or bath, this slightly raises your body temperature. The blood flow to your skin increases—this is why your skin tends to look a little pink when you’ve been immersed in hot water. After you get out of the shower or bath, the increased blood flow to your skin continues for a while, which helps to dissipate excess heat from your core and causes your body temperature to drop. This mimics the natural drop in body temperature that normally occurs as you approach bedtime.
The benefit to your sleep is not just theoretical. Research has shown that taking a hot shower or bath as part of your bedtime routine can help to improve sleep latency, meaning that it helps you to fall asleep faster.
Best Time and Temperature for a Hot Shower Before Bed
The best time to take a hot shower or bath is one to two hours before bedtime. In order to get the benefit, you’ll need to allow enough time for your body temperature to drop after you get out of the hot water. Many people find it’s beneficial to start their bedtime routine with their hot shower or bath about an hour before bedtime. Afterwards, you can prepare for sleep with some relaxing, screen-free activities.
Research has shown that using a water temperature of 40 to 42.5°C (104 to 108.5°F) is effective at improving sleep. In general, this will feel very warm to hot, although not so hot that it’s scalding. You don’t have to stay in the hot water for very long—research has shown that just 10 minutes is enough, although you can choose to stay a bit longer if you’d like.
You can take either a hot shower or a hot bath. Simply choose whichever one you prefer. Some people enjoy relaxing in a bath, perhaps while reading or listening to music. Others find a shower to be more practical and soothing. The relaxation that your hot shower or bath brings will help you to mentally prepare for sleep and release the stress of the day, so choose whichever option sounds best to you.
If you’re among the millions of people who sometimes find it challenging to fall asleep, adding a hot shower or bath to your routine could make it easier for you to drift off at night. Getting better sleep can make a huge difference for your short-term and long-term health, so prioritizing it is an important investment in your well-being.
FAQs
Can a warm shower help you fall asleep faster?
Yes. A systematic review in Sleep Medicine Reviews — analyzing 17 studies — found that a warm shower or bath 1–2 hours before bed reduces sleep onset latency, meaning you fall asleep faster. Participants fell asleep an average of 10 minutes quicker than normal. The effect is strongest at a water temperature of 40–42.5°C.
Why does showering before bed help you sleep?
Showering before bed helps sleep through two mechanisms: the physical temperature drop after exiting warm water cues your circadian rhythm to release melatonin, and the ritual itself acts as a consistent behavioural signal to your brain that sleep is approaching. Both the physiology and the routine reinforce each other over time.
Does a hot shower before bed help you sleep?
Yes. Research shows that taking a hot shower 1–2 hours before bed helps most people fall asleep faster. Hot water increases blood flow to the skin; when you step out, that heat dissipates quickly, causing a drop in core body temperature that mimics the natural cool-down your circadian rhythm uses to signal sleep onset.
How long before bed should you shower for better sleep?
About 90 minutes before you want to fall asleep is ideal, within a 1–2 hour window. This gives your body enough time to complete the post-shower temperature cool-down before you get into bed. Showering less than 30 minutes before bed may not leave sufficient time for your core to drop and could delay sleep onset.
What temperature should the shower water be for sleep?
Research supports a water temperature of 40–42.5°C (104–108.5°F). This feels very warm to hot but should not be scalding. Cooler water produces a weaker blood vessel response and a less pronounced post-shower temperature drop, reducing the sleep benefit.
Dr. Patricia Shelton, MD, is a medical communicator, neuroscientist, and educator with a passion for making complex medical information accessible. With a Doctor of Medicine and a Neuroscience degree from the University of Washington, she combines deep expertise with exceptional communication skills. Dr. Shelton teaches anatomy and physiology, writes on medical topics, and authored *The Yoga Doctor*. A certified yoga and meditation instructor, she champions a holistic approach to wellness and empowers audiences through clear, engaging health education.
