The thing is, if you study sleep, there are basically intervals of around 80-90 minutes called cycles. You go to sleep and wake up naturally, then divide your sleep to the rough number,
once you find your cycle lenght is eassy to calculate, mine is close to 90 min, so you can plan your sleep in full cycles, which means i can sleep well for 1.5, or 3, or 4.5, or 6 or 7.5 or 9 hours. There are people having shorter cycles, hence sleeping less. And few having longer cycles. Once you knoe your cycle you can plan adequatelly as sleeping in the middle of the cycle bring that groggyness sensation.
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Perfect Answer....