Jeany asks, "I read on one blog that you should sleep more to grow your hair. What does sleep have to do with hair?"
Well, I assume the idea is that cell renewal is most active at night when resting thus enabling new hair growth.
Other than that basic principle, I'm not aware of any correlation between hours of sleep and hair length.
I do know that when we're asleep, our hair isnt subjected to the elements or styling manipulation.
If anyone else can provide any other information, please inform us!