Sleep · Brain health technique
Hot shower, bath, or sauna before bed
Evidence grade: Context Dependent
Taking a warm shower, bath, or brief sauna session 1–2 hours before bedtime to raise skin temperature and trigger subsequent cooling that promotes sleep onset.
- Practice
- Sleep
- Principle
- Restoration
- Tactic
- Physiological & Metabolic Support
- Health domains
- hormonal
- Evidence grade
- Context Dependent
- Strength of evidence
- Medium
- Effort
- Low
- Time commitment
- Medium
How to practice Hot shower, bath, or sauna before bed
Take a warm bath or shower (100–104°F / 38–40°C) or sauna about 1–2 hours before bed. Avoid very hot or immediate pre-bed exposure, which can delay sleep via overheating. Combine with a cool bedroom for optimal thermal gradient.
The evidence behind Hot shower, bath, or sauna before bed
Meta-analyses of thermotherapy show that passive body heating 1–2 hours before sleep shortens sleep latency by 10–20 minutes and improves subjective sleep quality. Mechanism: heating skin promotes peripheral vasodilation, allowing the core temperature to drop faster, a key cue for sleep initiation. Evidence consistent but based on small trials.
More Sleep techniques
Take control of your brain health
BetterBrain gives you a personalized protocol of techniques like these, backed by science and tailored to you.