WebMD Answers
Humans go through four to six "sleep cycles" every night. Each cycle consists of five stages, ranging from very light sleep (stage 1) to very deep sleep (stage 4) and then the rapid eye movement stage, during which you are most likely to dream.
Waking up out of a deep stage 3 or stage 4 sleep is notoriously difficult. That's why being awakened from a nap can be so disorienting. It's also why waking too early in the morning can mean a miserable start to your day. Most people hit their deepest sleep between 4 a.m. and 6 a.m., so it's very hard to wake up during that time.
So wake up later if you can; otherwise, make sure you go to bed early enough to get a good night's rest.
Some other tips for waking up:
This answer should not be considered medical advice...
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