Hot Bath Pre-Sleep — 60-Second Protocol
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biohack · 2026-07-18
No sauna? A hot bath does the trick.
A 15-minute bath at 40 °C, taken 90 minutes before lights-out. The bath raises and then drops core body temperature, accelerating sleep onset. The cleanest passive sleep intervention if a sauna is not available.
The protocol
| Timing | 90 min before sleep |
| Duration | 15 min |
| Frequency | as needed |
| Water temp | 40 °C |
| Prerequisites | hydrate · exit if dizzy |
Skip this if
- pregnancy (consult)
- cardiovascular disease
- low blood pressure
- alcohol within 4 hours
Full transcript
No sauna? A hot bath does the trick. Fifteen minutes at forty degrees Celsius, about ninety minutes before bed. It warms your core, then the drop that follows is exactly the signal your body reads as time to sleep — so you fall asleep faster and go deeper early in the night. More protocols like this on agegen.ai. Generate your prime age!
Sources
- https://www.sleepfoundation.org/sleep-hygiene
- https://www.sleepfoundation.org/circadian-rhythm/light-and-sleep
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