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A lot of research seems to suggest that cold (something like 62F-68F) is indeed better for sleep. It makes sense if you think about it "evolutionarily" or whatever. Basically, your body feels warmth and it assumes the sun is what's heating you up, so suppresses sleep hormones and promotes wakefulness.

Anecdotally seems true for me, but I also have poor circulation to my extremities so I just suffer one way or the other.

> It makes sense if you think about it "evolutionarily" or whatever. Basically, your body feels warmth and it assumes the sun is what's heating you up, so suppresses sleep hormones and promotes wakefulness.

We evolved in places that were hotter [0] on average than where most HN commenters reside.

[0] ... unless paleoclimate in Africa was much colder than I guess it was.

and it's still colder at night there

“ unless the weather is uncomfortably warm and there’s no air con.”

I think that’s what this is for? I love a cool bed on a warm evening

In my experience, I might like a cool bed if I was hot in the evening (say, I was physically active). Otherwise, I prefer a cool room with a nice blanket.