Re: How to help my 13 yr old fall asleep?
I would question how much stuff she's doing on her cell phone. My daughter likes to use her iPod for music at night, or to read for a few minutes, but she always ends up messaging friends or playing a game instead, so we had to start a rule that at bedtime it's put in the living room. She's allowed an audio book or music in the cd player, but nothing that has more options.
More physical activity during the day would probably help, as well. Yoga or some sort of deep breathing/meditation could help with calming her thoughts, as well.