Research
Hormonal
Small increases in skin temperature (0.4°C within the 31-35°C range) can shorten sleep latency and promote deeper sleep without altering core body temperature.
You do not need to significantly heat your room or body to fall asleep faster. A subtle warming of your skin (via bedding) by just 0.4°C is sufficient to shorten sleep latency. This is particularly useful for elderly individuals or insomniacs who may have deficits in normal thermoregulation.
GoodSupportsHIGH confidence
Small changes in skin temperature of only 0.4◦C (in the 31–35 range), can shorten sleep latencies without altering core temperature. They can even encourage deeper sleep in more challenging patient groups, such as elderly insomniacs.
Why this rating
Based on specific experimental studies using thermosuits cited in the review.
Source
The Temperature Dependence of Sleep
Edward C. Harding et al. · Frontiers in Neuroscience · 2019
DOI 10.3389/fnins.2019.00336
narrative_reviewCited 243×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- NOS1-expressing glutamatergic neurons in the preoptic area link thermal sensory information to NREM onset and body cooling.Strong
- Creating a warm microclimate around the skin (31-35°C) via bedding or nesting behavior initiates NREM sleep by triggering distal vasodilation and activating preoptic hypothalamic circuits that link warmth to body cooling.Good
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