The 65°F Sleep Ladder

Summary

Core body temperature must drop ~1°C to initiate and sustain deep sleep. Ambient bedroom temperature directly modulates that drop.

Takeaway

Bedrooms held between 60–67°F produce the deepest, least-fragmented sleep across age groups.

Citations · 2

1. [01]
   Okamoto-Mizuno K, Mizuno K (2012). Effects of thermal environment on sleep and circadian rhythm. Journal of Physiological Anthropology. doi:10.1186/1880-6805-31-14
   Source
2. [02]
   Harding EC, Franks NP, Wisden W (2019). The temperature dependence of sleep. Frontiers in Neuroscience. doi:10.3389/fnins.2019.00336
   Source