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You have normal sleep rhythms around 90 minutes or so for REM sleep. If you wake up in the middle of one of those cycles and it's under 6 hours, your body will want to go back to sleep. It's why you can wake up after 4 or 5 hours and feel better than if you got 5 or 6 hours. It is tough to judge this though because everyone is a little different. And if you sleep with no alarm clock, your body should wake up after it gets as much sleep as it needs.
Have you started exercising or anything that would require your body to repair itself and want more sleep?
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