Waking up in sweat?

Anonymous
This is very embarrassing for me, which is why I'm doing it anonymously.. and I'm NOT trolling with this question, so please give me serious responses.

Okay, so lately I've noticed that when I wake up, my butt crack is a little sweaty and I'm not sure why it gets this way. I don't feel like I get hot throughout the night, so I was wondering is this normal or odd?
Waking up in sweat?
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