How to keep my hair straight overnight?

Anonymous
I have curly hair so I straighten it the night before school to save time in the morning, but when I sleep on it it starts to curl again and I end up having to re-straighten the whole thing instead of just touching up in the morning. Is there anything I can do to keep it straight? A ponytail maybe? I don't know? Any tip please?
How to keep my hair straight overnight?
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