Appearance of Scars in the Morning?

Dear Doctors, Can someone explain to me how does it happen that my acne scars are almost invissible in the morning, just after I get up from the bed but during the next hours they are getting back to normal (easily visible and not that small). Difference between the morning and even afternoon is HUGE! Surely I'm not dehydrated because I'm drinking a lot of water every day. Thank You for Your answers.

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