Pre-exam anxiety insomnia

It's 2 in the morning, I have to be up at 5, and I'm stuck awake with insomnia after waking up an hour ago with another math-related dream that wouldn't let me sleep. I feel overheated, despite the AC running, and for some reason, everything seems too peaceful and quiet, while my brain is anything but.

Damn shame it's not raining. That's one thing that never fails to relax me.