I struggle with sleep problems sometimes, usually caused by too much stress or too many things to think about. They don't have to be negative things, just my head being busy. I'm usually a light sleeper, but stress will cause me to sleep even lighter, wake up at any disturbance, or wake up at the end of every sleep cycle, if I've understood my sleep theory. It sounds like you may have a sleep cycle that ends about 2:30, and you're having trouble getting into the next one. I believe it's common for one's core temperature to rise a little at the end of a sleep cycle too, so the hot flashes may be "telling" your body to wake up.
Right now we're selling a house which means busy evenings meeting new people and having to remember lots of little details, and I have to sleep with an eye mask and ear plugs every night. Truth be told I'd love to sleep completely alone a night once in a while because I sleep a lot better then, but I haven't had the heart to suggest that to my dh yet :-)
Not having an alarm clock or using a different one can make me sleep worse as well, I can be incredibly sensitive to any subconscious idea that I need to "pay attention" rather than just relax and go to sleep.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett