Is it okay to sleep with wet hair?

Potential Risks of Sleeping with Wet Hair

As stated by Dr. Stephens, there are a few key issues that can arise from going to bed with damp hair. One major concern is the possibility of fungal infections and scalp irritation. When the scalp remains wet, it creates an environment conducive to fungal growth, which can lead to problems such as dandruff or dermatitis, which refers to skin or scalp rashes and irritation.