Hair Texture Changes Throughout the Day

I hope this is an appropriate question for this sub, but I'm just curious if there is any answer to this question. I can post elsewhere if it would be appropriate.

Is it possible for hair texture to change throughout the day? Such going from very defined 's' waves to straight with no styling products. I know that a change in environment can affect hair, but what is the science behind waking up with wavier or even curlier hair after not using rollers or braiding the hair?