A Warm Shower Before Bed Speeds Sleep — and Heat Isn't Why - Video

How to fall asleep fast? A review of 13 pooled studies found a warm shower 1–2 hours before bed helped, and heat isn't why.

Shahab Haghayegh and colleagues pooled the controlled studies on warming the body with water before bed: baths, showers, foot baths. Seventeen studies met their criteria and thirteen could be pooled. Water at about 40 to 42.5 °C, taken one to two hours before bedtime, for as little as ten minutes, was linked to falling asleep faster, better self-rated sleep, and more of the night in bed spent actually asleep.

The surprise is the direction. You would expect heat to keep you awake. The authors explain it this way: warm water opens the blood vessels in the hands and feet, which lets the body shed heat afterwards, so the core temperature falls faster. A falling core is one of the body's own signals that it is time to sleep. It is the cooling, not the warming.

The honest part: small studies with different designs, pooled together. It is an average, not a promise to any one person, and not a treatment for insomnia. If you have a heart or circulation condition, ask a doctor before a hot bath.

Practice: tonight, take a warm shower an hour or two before bed. Then let the cooling do the rest. Nothing to buy, nothing to track.

Ushna (उष्ण) — warmth.

Two Minutes, morning and night. Join the practice.

Source:
Haghayegh, S., Khoshnevis, S., Smolensky, M. H., Diller, K. R., & Castriotta, R. J. (2019). Before-bedtime passive body heating by warm shower or bath to improve sleep: A systematic review and meta-analysis. Sleep Medicine Reviews, 46, 124–135.