Sleeping Patterns

I seem to have settled into a rather annoying pattern in the past week or so. I get to bed around 8:30 AM if I worked the night before, or around 5-ish if I didn't. I sleep for 3 or 4 hours, and then I suddenly wake up for no apparent reason. It then takes me another 2 hours or so to get back to sleep, whereupon I sleep for around another 6. The upside to this is that I'm getting plenty of sleep when you add it all up -- probably too much, even. The downside is that it's really hard to get much of anything accomplished when you're spending 12 hours a day in bed...

I dunno, maybe I am just lazy...