Yep, exactly for me too. Those first couple hours are rough. I've always tended to wake up a couple times really early, look at the clock, then go right back to sleep until my "normal" wakeup time. But since the breakup, the first time I open my eyes those memories flow in and I can't get back to sleep.
The rest of the daytime is OK. Then from late evening on it gets tough again. On top of all this, a blizzard kept me basically indoors all weekend with nothing to stare at but the four walls (and some TV and my computer)...