How about measuring your sleep quality from now on? With this new app brought you by Ravens Incorporated, you can do that.
It is simple. When you lay down on bed, activate "Im Sleeping" option. The app will register your sleep quality.
When you wake up, select "Im awake". You also let the app know if you didnt have a good sleep because you have smoked, drinked beer, watched too much tv,etc one day earlier.
You can have weekly and month reports. Also sleep quality reports. Really useful and handy application.