The claim
“A sauna before bed helps you sleep better.”
Early. In an online survey, 83.5% of sauna users said sauna helped their sleep, and warm baths before bed improve sleep in measured studies. No study has recorded sleep after a sauna with lab equipment or a wrist tracker.
Updated Sep 24, 2026 · 2 studies reviewed
Some human data and a plausible mechanism. It needs better trials before anyone can lean on it.
People say it in places like these
Huberman Lab newsletter
A sauna in the afternoon or evening helps you fall asleep.
See an example ↗Peter Attia's podcast
He takes a sauna before bed partly for sleep and wonders whether better sleep explains part of sauna's link with longer life.
See an example ↗
The research found this
The sauna number comes from the Global Sauna Survey. It ran online from October 2016 to October 2017, and 83.5% of its 482 valid respondents said sauna use benefited their sleep.Source 1 · Cross-sectional studyA hot topic for health: Results of the Global Sauna SurveyHussain JN, Greaves RF, Cohen MM. Complementary Therapies in Medicine, 2019.Read the paper ↗PubMed ↗ The respondents chose to take part, and most were educated non-smokers who exercised. Their sleep was never measured.
We found no study that recorded sleep after a sauna with an overnight lab test or a wrist-worn activity tracker. The closest sauna data come from a trial of 37 people with chronic tension-type headaches. Eight weeks of regular sauna eased their headache intensity and made no difference to their sleep.Source 2 · Randomized trialEfficacy of Regular Sauna Bathing for Chronic Tension-Type Headache: A Randomized Controlled StudyKanji G, Weatherall M, Peter R, et al.. The Journal of Alternative and Complementary Medicine, 2015.Read the paper ↗PubMed ↗ After a post-workout infrared session, 16 basketball players showed no change in overnight heart rate or heart rate variability.Source 3 · Crossover trialA post-exercise infrared sauna session improves recovery of neuromuscular performance and muscle soreness after resistance exercise trainingAhokas EK, Ihalainen J, Hanstock HG, et al.. Biology of Sport, 2023.Read the paper ↗PubMed ↗
Warm water has better data. A 2019 review included 17 studies and pooled 13 of them, and it found that a warm shower or bath at 40–42.5°C improved self-rated sleep quality and sleep efficiency. Taken one to two hours before bed, for as little as 10 minutes, it helped people fall asleep faster.Source 4 · Meta-analysisBefore-bedtime passive body heating by warm shower or bath to improve sleep: A systematic review and meta-analysisHaghayegh S, Khoshnevis S, Smolensky MH, et al.. Sleep Medicine Reviews, 2019.Read the paper ↗PubMed ↗
Two more studies measured sleep directly. Six young women took a 90-minute warm bath in the afternoon that raised rectal temperature 1.8°C, and that night's sleep recording showed more slow-wave sleep and less REM sleep.Source 5 · Clinical trialNight-time sleep EEG changes following body heating in a warm bathHorne J, Reid A. Electroencephalography and Clinical Neurophysiology, 1985.Read the paper ↗PubMed ↗ Among 2,252 older Japanese adults who wore activity trackers, nights with a hot bath before bed brought 1.3% higher sleep efficiency and 3.3 fewer minutes awake.Source 6 · Cross-sectional studyAssociation between before-bedtime hot-tub bathing and sleep quality in real-life settings among community-dwelling older adultsTai Y, Obayashi K, Yamagami Y, et al.. Sleep Health, 2025.Read the paper ↗PubMed ↗
The dial reads 58°H for four reasons
How the reading adds up
18 + 14 + 12 + 14 = 58°H
EvidenceWhat kind of evidence exists in people?
18/25The sauna evidence is a survey of 482 self-selected users and one small trial whose sauna group slept no better.Source 1 · Cross-sectional studyA hot topic for health: Results of the Global Sauna SurveyHussain JN, Greaves RF, Cohen MM. Complementary Therapies in Medicine, 2019.Read the paper ↗PubMed ↗Source 2 · Randomized trialEfficacy of Regular Sauna Bathing for Chronic Tension-Type Headache: A Randomized Controlled StudyKanji G, Weatherall M, Peter R, et al.. The Journal of Alternative and Complementary Medicine, 2015.Read the paper ↗PubMed ↗ The measured sleep data come from warm baths and showers.Source 4 · Meta-analysisBefore-bedtime passive body heating by warm shower or bath to improve sleep: A systematic review and meta-analysisHaghayegh S, Khoshnevis S, Smolensky MH, et al.. Sleep Medicine Reviews, 2019.Read the paper ↗PubMed ↗
ConsistencyHas the finding held up?
14/25Warm-bath studies agree with each other, and they range from a lab study of six women to a pooled review of 17 studies.Source 5 · Clinical trialNight-time sleep EEG changes following body heating in a warm bathHorne J, Reid A. Electroencephalography and Clinical Neurophysiology, 1985.Read the paper ↗PubMed ↗Source 4 · Meta-analysisBefore-bedtime passive body heating by warm shower or bath to improve sleep: A systematic review and meta-analysisHaghayegh S, Khoshnevis S, Smolensky MH, et al.. Sleep Medicine Reviews, 2019.Read the paper ↗PubMed ↗ The one sauna trial that tracked sleep found no change.Source 2 · Randomized trialEfficacy of Regular Sauna Bathing for Chronic Tension-Type Headache: A Randomized Controlled StudyKanji G, Weatherall M, Peter R, et al.. The Journal of Alternative and Complementary Medicine, 2015.Read the paper ↗PubMed ↗
MagnitudeDoes the claim match the size of the effect?
12/25The popular 83% figure counts users who said sauna helped their sleep, so it measures what they perceived.Source 1 · Cross-sectional studyA hot topic for health: Results of the Global Sauna SurveyHussain JN, Greaves RF, Cohen MM. Complementary Therapies in Medicine, 2019.Read the paper ↗PubMed ↗ For hot baths the measured gain in older adults was modest: sleep efficiency rose 1.3% and time awake at night fell 3.3 minutes.Source 6 · Cross-sectional studyAssociation between before-bedtime hot-tub bathing and sleep quality in real-life settings among community-dwelling older adultsTai Y, Obayashi K, Yamagami Y, et al.. Sleep Health, 2025.Read the paper ↗PubMed ↗
DoseDoes the studied protocol match how people use it?
14/25No study has tested a sauna at bedtime. The bath studies used water at 40–42.5°C one to two hours before bed, sometimes for as little as 10 minutes.Source 4 · Meta-analysisBefore-bedtime passive body heating by warm shower or bath to improve sleep: A systematic review and meta-analysisHaghayegh S, Khoshnevis S, Smolensky MH, et al.. Sleep Medicine Reviews, 2019.Read the paper ↗PubMed ↗
The claim drifts from the data here
The 83% figure describes what enthusiasts reported about their own sleep. The survey had no comparison group, and the people who answered it chose to.Source 1 · Cross-sectional studyA hot topic for health: Results of the Global Sauna SurveyHussain JN, Greaves RF, Cohen MM. Complementary Therapies in Medicine, 2019.Read the paper ↗PubMed ↗
The measured sleep gains belong to warm water. A bath and a sauna both warm the skin and raise core temperature, and whether a sauna changes sleep the same way, or how long before bed it would need to happen, has not been tested.Source 5 · Clinical trialNight-time sleep EEG changes following body heating in a warm bathHorne J, Reid A. Electroencephalography and Clinical Neurophysiology, 1985.Read the paper ↗PubMed ↗Source 7 · Crossover trialComparison of thermoregulatory, cardiovascular, and immune responses to different passive heat therapy modalitiesAtencio JK, Reed EL, Wiedenfeld Needham K, et al.. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 2025.Read the paper ↗PubMed ↗
Put it to use
If an evening sauna helps you wind down, keep it and finish an hour or two before bed. That is the window in which warm baths and showers improved sleep in pooled studies.Source 4 · Meta-analysisBefore-bedtime passive body heating by warm shower or bath to improve sleep: A systematic review and meta-analysisHaghayegh S, Khoshnevis S, Smolensky MH, et al.. Sleep Medicine Reviews, 2019.Read the paper ↗PubMed ↗
From our sister magazine
Sauna Monthly covers the rings and straps that track resting heart rate
No sauna study has tracked sleep with a wearable. A ring worn through sauna nights and ordinary nights lets you compare your own.
Sauna Monthly · Guide
A wearable shows the adaptation happening
Resting heart rate and HRV shift across a block of regular sauna weeks.
Sauna Monthly · Shop
An indoor sauna puts the heat down the hall
Traditional cabins fit a spare room or a basement.
Oura
Oura Ring 4
People also ask
Is it good to use a sauna before bed?
No study has measured sleep after a sauna, so the best timing is unknown. In pooled studies, warm baths or showers at 40–42.5°C helped people fall asleep faster when taken one to two hours before bed.Source 4 · Meta-analysisBefore-bedtime passive body heating by warm shower or bath to improve sleep: A systematic review and meta-analysisHaghayegh S, Khoshnevis S, Smolensky MH, et al.. Sleep Medicine Reviews, 2019.Read the paper ↗PubMed ↗
Does sauna increase deep sleep?
That idea comes from warm baths. Six women who took a 90-minute warm bath in the afternoon had more slow-wave sleep that night.Source 5 · Clinical trialNight-time sleep EEG changes following body heating in a warm bathHorne J, Reid A. Electroencephalography and Clinical Neurophysiology, 1985.Read the paper ↗PubMed ↗ Deep sleep after a sauna has never been measured.
Where does the 83% sauna sleep figure come from?
It comes from the Global Sauna Survey, where 83.5% of 482 self-selected users said sauna use benefited their sleep.Source 1 · Cross-sectional studyA hot topic for health: Results of the Global Sauna SurveyHussain JN, Greaves RF, Cohen MM. Complementary Therapies in Medicine, 2019.Read the paper ↗PubMed ↗ The survey recorded opinions and had no comparison group.
Check these claims next
58°H
Early
“Cold exposure improves your sleep.”
The overnight sleep data come from trained men after evening exercise, where one small study found fewer arousals after a cold bath and another found no change. No controlled trial has measured how a cold plunge affects sleep in people who aren't athletes.
57°H
Early
“Sauna treats depression.”
One session of medical whole-body heating eased depression more than a sham session in a trial of 29 people. When a pilot trial added infrared-dome heat to talk therapy, it did no better than sham heat.
51°H
Early
“Sauna relieves chronic pain and arthritis.”
Small studies found pain eased with sauna in conditions from fibromyalgia to headache, and one randomized trial found headaches 1.27 points less intense. Most studies had no control group, and arthritis gains over four weeks were not statistically significant.
We cited these sources
- 01Hussain JN, Greaves RF, Cohen MM. A hot topic for health: Results of the Global Sauna Survey. Complementary Therapies in Medicine. 2019;44:223-234. doi:10.1016/j.ctim.2019.03.012 PMID 31126560
- 02Kanji G, Weatherall M, Peter R, Purdie G, Page R. Efficacy of Regular Sauna Bathing for Chronic Tension-Type Headache: A Randomized Controlled Study. The Journal of Alternative and Complementary Medicine. 2015;21(2):103-109. doi:10.1089/acm.2013.0466 PMID 25636135
- 03Ahokas EK, Ihalainen J, Hanstock HG, Savolainen E, Kyröläinen H. A post-exercise infrared sauna session improves recovery of neuromuscular performance and muscle soreness after resistance exercise training. Biology of Sport. 2023;40(3):681-689. doi:10.5114/biolsport.2023.119289 PMID 37398966
- 04Haghayegh S, Khoshnevis S, Smolensky MH, Diller KR, Castriotta RJ. Before-bedtime passive body heating by warm shower or bath to improve sleep: A systematic review and meta-analysis. Sleep Medicine Reviews. 2019;46:124-135. doi:10.1016/j.smrv.2019.04.008 PMID 31102877
- 05Horne J, Reid A. Night-time sleep EEG changes following body heating in a warm bath. Electroencephalography and Clinical Neurophysiology. 1985;60(2):154-157. doi:10.1016/0013-4694(85)90022-7 PMID 2578367
- 06Tai Y, Obayashi K, Yamagami Y, Saeki K. Association between before-bedtime hot-tub bathing and sleep quality in real-life settings among community-dwelling older adults. Sleep Health. 2025;11(6):908-915. doi:10.1016/j.sleh.2025.07.008 PMID 40803898
- 07Atencio JK, Reed EL, Wiedenfeld Needham K, Lucernoni KM, Comrada LN, Halliwill JR, et al.. Comparison of thermoregulatory, cardiovascular, and immune responses to different passive heat therapy modalities. American Journal of Physiology-Regulatory, Integrative and Comparative Physiology. 2025;329(1):R20-R35. doi:10.1152/ajpregu.00012.2025 PMID 40332494