My son has sleeping troubles?!

My son has sleeping troubles?

Okay so he usually takes benedryl at 10PM and crashes at 11PM. Then, he wakes up at around 3AM and cant get back to sleep.

If he doesnt take benedryl, he stays up until 5-7AM and sleeps until 2PM.

I know this is a totally unhealthy sleeping pattern so what do you suggest he do?

-He's 15 btw

5 days ago
No, he's a total health freak.
He only drinks water, milk and v8 and coffee when he wakes up..

Im 15, I had the problem..
Just make him stay up for 2 nights in a row and dont let him crash until 9-10pm
Thats how I fixed my pattern