What causes bedhead?

How does hair just take shape without the addition of heat or rewetting hair? Sometimes you wake up and the hair, despite combing, retains a permanent "reconfiguration".


  • @DaveStone That's due to mechanical stress  but that's something you don't want to intentionally put your hair under. 
  • PerryPerry Administrator, Professional Chemist
    It's also due to hydrogen bonding. When you sleep, you sweat. Water gets on strands and can cause bonding within the fiber and between fibers. 
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