Been going through something similar. It's a manic sleeping pattern without the mania. Last night I didn't sleep at all---tried going to bed around 4, but couldn't shut off my brain or close my eyes. I finally gave up at 6, when it was already light out. I've had a number of these kind of nights in recent weeks and all I can think is, I'll make up for lost time in the winter. I'm such a slug in the cold months.