How did you sleep?

Yes, there is an App for that.
You put your phone on your bed under the sheets at night.
The accelerometer tracks your movements to determine how well you are sleeping.
Here is how I slept last night:


I set up the phone at 10:30pm.
I read in bed from 11 to 12:10am.
Looks like I fell asleep around 1am, had 4 dreams, and woke up at 5:30am when Benson knocked my iPhone out of the bed. And as it shows I wasn't able to fall back asleep until 7.
Looks like I only had 4.5 hrs of real sleep.

The data alone is worth the $1.
But there is a benefit.
You set a peaceful alarm for the latest you can sleep in.
Then, anytime within 30 mins of that alarm it will wake you up if it senses you are in light sleep. This is because they say you won't feel rested if you wake up from a deep sleep.

For example, I set mine to 7:20am and it went off at 7:14am after I had fallen asleep.