The bedtime calculator allows students to know exactly how much sleep is ideal to remain healthy. The best possible wake-up time is highlighted in dark green, with the less optimal times in lighter shades.

The calculator allows students to sleep in full complete cycles. Waking up in the middle of a sleep cycle – regardless of the number of hours slept – can result in tiredness in the morning, and can cause a student to be crankier and start their day off on the wrong foot. provides two options for students. The first option allows a student to set what time they need to wake up at, and suggests potential times to go to bed. The later option is available for students who are going to bed right after they select it, and provides optimal times to wake up. also provides for the 14 minutes that an average human takes to fall asleep fully after going to bed. This allows students to plan bedtimes in advance and work towards achieving the most healthy amount of sleep possible.

[Photo courtesy of Ed Yourdon on Flickr. Licensed under CC BY-SA 2.0.]