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This is according to British scientists, by the way (and this is not a joke).
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Anyone who doesn't vote for the second option is a fool!
Excitement about something
If anything, the most unpleasant reason for me is "Too hot or cold." To be specific, sometimes it gets stuffy. You adjust the window slightly incorrectly, and that's it. If it's the other way around, namely cold, there's a risk of a sore throat, but it doesn't really affect the quality of sleep. Typical.
There are already four of them. What are you even doing on HeroesWorld...
Excitement
Although, no, that's not true either. I get excited when something relatively good happens. When everything is bad, I sleep like a log.