It was the rule in our house growing that you never went to bed with wet hair or as my mom said "with a wet head". It seemed like a sensible rule. She said if you do you'll wake up with a stiff neck! I didn't want that. So that was my rule with my girls, no wet heads at bedtime. Well now they have girls of their own. However, they don't have the no wet heads at bedtime rule in their homes! They don't buy the stiff neck story!