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Sleeping the same hours every night really helps me get a much more restful sleep than when I'm fluctuating by an hour every day.
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/signed
Also, sleep cycles take approximately 90 minutes (varies from person to person). Part of the sleep cycle is the REM stage, if you wake up during this, you wake up groggy. Try sleeping in multiples of 90 minutes. Just so people don't think I mean sleep 90 minutes, wake up, and sleep another 90 minutes... sleep for 6 hours, or 7.5, or 9 hours to avoid waking from an alarm during the REM stage of sleep.
Jam it back in, in the dark.