How strong is the evidence for Bedroom Temperature?

Sleep onset and maintenance are physiologically coupled to a decline in core body temperature and a rise in distal (hand/foot) skin temperature, a mechanism laid out in detail across several reviews of sleep thermoregulation and linked to insomnia, restless legs syndrome, and other sleep disorders when disrupted. That evidence is currently rated emerging (38/100), built on 8 published studies, including 1 randomized controlled trial and 3 meta-analyses -- still too little to draw firm conclusions from.