Sure, but we're just different in that respect. Trust me, I'm a *very* sound sleeper, and so normally when my head hits the pillow, I'm out for the count for 9/10 hours - and I mean *properly comatose*, and almost no noise will wake me, but I simply can't cope with hot stuffy bedrooms - it blocks me up and I struggle to breathe (not in a serious way, but enough for it to be quite uncomfortable), plus it gives me a very dry throat, and that then wakes me up.
The problem with air-con is that it's not particularly healthy to have it on constantly, and that affects me too (causing mild flu-like symptoms), so it would need to be used in bursts - but how can you do that when you're asleep? If I had air-con on all night, I'd probably wake up ill....That's also one of the reasons why I dislike flying.
You say 21C is "perfect"... Is that inside or outside? Outside, that's fine, but DEFO NOT inside. Perfect for me inside, and read as comfortable, is 17/18C, which is what I need to ensure a good night's sleep, coupled with low humidity. It was 23C in our bedroom last night, so I slept (for a bit) outside in the backyard on the lounger, with next to fuck all on!
This is why I generally prefer the winter months, because our house is more suited to it, and when it's cold outside, it's a damn sight easier staying warm inside (as we have a lovely log burner to keep us warm), BUT ONLY as warm as *we* want to be - not what the sun outside dictates!
And for us, that makes things much more comfortable
Marco.