Tracking Time to Fall Asleep.
This is completely optional. You don't even need to install the AutoSleep Watch app to track sleep.
This feature is designed for people that wear their Watch when sleeping.
Because AutoSleep can't automatically know of your intention to decide to go to sleep you need to tell the app.
What this does is send a timestamped event to the AutoSleep app. This is then used to calculate the time between this event and when the app detected that you fell asleep.
It is designed to be used once per day, prior to your main sleep. Using this feature also tells the app to ignore any sleep prior to this point.
How to do this
This is done by using the 'Lights Off' feature. There are three ways to do this.
Using the Widget
To add the widget, go to your iPhone home screen, swipe your finger from left to right then press Edit on the Today view. If on an iPhone 6s or 7, you can also add quickly by 3D touching the AutoSleep app widget.
This then presents a simple widget as follows:
When you turn your lights off to go to sleep, simply touch the switch. Note: You do not need to unlock your iPhone to do this.
This will then change the widget as follows:
You then do not need to do anything else. From here, everything is automatic and the AutoSleep app will reset your switch for you in the background once you are awake after you unlock your iPhone.
The Lights Off time will then show on your sleep clock as a vertical yellow bar and the time that you took to fall asleep will be displayed in your sleep quality analysis.
Using the Watch
You can also use the Watch app to turn 'Lights Off'.
To do this, scroll the sleep rings and below you will see the Lights Off switch.
This will immediately start a timer. This is to give you an indication as to how long you've been in bed. If you have an AutoSleep complication on your Watch face, this will also show the timer.
To end this mode on your Watch, there are two methods:
Editing Lights Off
In the AutoSleep iPhone app, if you need to correct or remove the Lights Off entry, you can either touch the vertical yellow bar on the clock, or go into Day View and press the lamp button.