The idea behind this website is more sleep isn't always better. It helps you get better sleep by waking you up right at the end of a sleep cycle.
The website itself may not look like much, but it will help you feel your best when you wake up. You enter in the time you will wake up and it will calculate when you need to fall asleep. It suggests it takes about 14 minutes to fall asleep, so you need to plan your bedtime accordingly. You can also calculate when you should wake up based on when you go to sleep.