Don't sleep while your hair is still wet!!.....?

Philippines
@whengcat (1444)
May 3, 2011 1:26am CST
I usually take a shower at night due to the hot summer season in our place. This way, I can somehow comfortably get myself to sleep. One time, my mother-in-law reminded me to first let my hair dry before going to sleep. She said its bad for the health if I do sleep while it's still wet, I may go blind or worst, never woke up at all.... This makes me feel scared so I do follow her advice, I make sure that my hair's all dry before going to bed. But on the back of my mind, I have some questions. Is it really bad for the health? are there scientific explanation about this?