Simple Sleep can track how long you sleep without you doing anything! Simply place your phone on a table or non-moving surface while you sleep. The app doesnt even need to be open!
*****Requires iPhone 5s or higher*****
(Not including 5c)
Features:
Keeps a 7 day history of your sleep
Log your sleep data to the apple health app
Easy to use: you dont need to think about the app until you want to log your sleep in the morning
Great for battery: you dont need to have your phone plugged in, or any app running
Reminds you to log your sleep each morning