from what i know, which was what my grandma told me, it's not good to sleep with wet hair as the "wetness" will go into ur head, accumulate and cause headaches when u're old. (sorry idk how to translate it from chinese to english)
doing it often is bad, but i dont think doing it once will get u sent immediately to a hospital sorry ╮( ̄▽ ̄)�......
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