Weirdest Jetlag Ever

Is this normal? For the past five nights, I've gone to bed at a reasonable hour (like, around midnight), suddenly woken up at about 4am for absolutely no reason and been completely awake for about two hours, and then slept again until about 10am. Just to throw things off, I worked like a crazy person until about 3am yesterday, went to bed, and now it's 7am and I'm sitting in a long-sleeved shirt and underwear with a cup of tea and it's still dark out. I'm not a morning person, and I can't afford to have my mornings starting in mid-afternoon. I'll be totally misanthropic.