Hmm... is it possible that your teen is in denial about having bipolar?
I know I have teens (I'm a step parent), and they will have varied sleep schedules. They don't have bipolar but we expect them to say lights out at about 10-10:30pm.
Maybe your teen is in denial and hasn't been educated about the importance of regular sleep schedule? Just an idea. I don't mean to offend.
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Bipolar/BPD
Abilify 5mg
Prozac 40mg
Fish oil and vitamin D
"Of course it is happening inside your head Harry, but why on Earth should that mean that it is not real?"
-Albus Dumbledore
