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(picture NOT MINE got from this website : http://www.freeimagesarchive.com/img5084.search.htm )
Sleep cycles are very important!, Having a good sleep cycle is what jump starts out day to a good one. not to being tired all day.
this calculator takes the time that you have to wake up by, and gives you a set of times which you must fall asleep by so when you wake up in the morning you will fell fresh and ready for your day
you should really try it! it works!
Source link: http://www.freeimagesarchive.com/img5084.search.htm