If I get up earlier than I want to, I just go back to sleep. It may be because I am cold, or because I need to use the bathroom. I feel that the morning sleep refreshes me a lot, and I basically fall asleep the moment my head touches the pillow again, so I don't think it would take more than an hour to get to the REM phase. But then again, I almost never wake up earlier than scheduled, because I usually get less sleep than I need, and have to make up for it whenever I can. I wake up at 5:30 2 days a week to go to the Tai Chi lessons, and on the rest of the week, I get up at 7 or 8, and I have no difficulty getting up ever, especially if I have to be somewhere.
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