Rocker PETE WENTZ has to carefully balance the sleeping pills he takes to nod off at night - because a wrong dosage keeps him awake hallucinating.

As well as anxiety, attention deficit disorder (ADD) and depression, the Fall Out Boy star suffers from insomnia and needs help getting to sleep.

He tells Playboy magazine that without medication he can only sleep for an hour at a time.

Wentz explains, "If I don't take an Ambien, I'll sleep for an hour. With Ambien, I'll sleep from 2am to seven (am). But, if you don't fall asleep, Ambien makes you hallucinate.

"About four months ago I took Ambien and almost set the house on fire."

And the fact that his wife Ashlee Simpson is pregnant only serves to make matters worse: "She goes to bed at eight... so it's just me and the dogs, hanging out. You don't even know the transcendent conversations we have."