Wakeytime Calculator suggests times that you should go to sleep at to wake up feeling less groggy and more rejuvenated. Simply choose the time that you need to wake up at and Wakeytime Calculator will give you four optimal times that you should try to sleep at. Wakeytime Calculator chooses times based on the average length of sleep cycles. Waking up after the end of a sleep cycle reduces grogginess.
*It takes an average of 15 minutes for a person to fall asleep, so plan accordingly!