It's called a sleep disorder for a reason

To bed at 11 last night, awake at an estimated 2:30 with achy knees and soggy lungs. And stayed awake thereafter because I had to be up at 7; if I hadn't had a morning shift I could have dosed myself and gone back to sleep-- probably till 7-- but didn't want to chance being ripped from deep sleep and having to function in the zombie state that follows sudden waking. So go me, got through an 8:30 to 3:30 day on three hours, but now will be a zombie for the rest of the weekend instead.