Insomnia AGAIN

Dude. This is just getting ridiculous. Tonight, I went to bed at 11:00. Finally fell asleep sometime between 11:30 and 12:00. At 1:00, the phone rang. When I picked up, there was no one there. Five minutes later, it rang again. Picked up, no one there. But the damage was done. It's now 4:20 and I still haven't fallen back to sleep. Seriously. What is up?!