It's a crapshoot for me. 13 years ago I started waking up at 0323 every morning.....like clockwork.....on a digital clock, for two weeks straight at that exact time. Never did figure that one out. It was really odd and frustrating. But these days it's anywhere between 0230 and once in a blue moon, maybe 0800. I do find that regardless what time I go to bed, I wake up almost exactly 5 hours later. Sometimes I can get back to sleep, sometimes not. Today I got up around 0430.