Is Bedroom Temperature good for sleep quality?

The evidence is still emerging, so it's too early to say for certain. 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's reflected in an evidence score of 38/100 for its role in sleep quality, drawn from 8 studies (1 RCT), with an estimated impact on longevity rated limited (30/100).