Record Sleep Helper app for iPhone and iPad

Record bed time
A statistical chart that produces sleep data
Set "hope for bed time"
Setting up a bedtime notice, App sends out a notice at the best time to remind you to go to bed.
App design concept:

On the market of App sleep or sleep quality are put on the bracelet, sleeping in the detection, but this is a problem, if you sleep four hours, this is four hours of deep sleep, sleep the whole body motionless, then more than seven points to work or class climbing it has no meaning that "good" sleep quality?
What modern people need is more sleep.
So the focus of the whole App design is on how to let