Future Apple Watches may be able to adjust alarms based on how long it takes you to fall asleep — Apple World Today

The idea is for the smartwatch to determine when a user intends or attempts to go to sleep based on detected sleep ritual activities. Sleep ritual activities can include those activities a user performs in preparation for sleep. The mobile device can determine when the user is asleep based on detected sleep signals (e.g., biometric data, sounds, etc.). In some implementations, Apple Watch can determine recurring patterns of long or short sleep onset latency and present suggestions that might help the user sleep better or feel more rested.

Most folks require a certain amount of sleep at night to feel well rested the following day. Often, when a person works, the person will set an alarm to wake them up at an appropriate time so that they can arrive at work on time. To get sufficient sleep, the person will go to bed at a time that allows for an appropriate amount of sleep (e.g., 7 hours, 8 hours, etc.). 

However, most people don’t fall asleep right away when they go to bed. So, even if the person goes to bed at an appropriate time to provide 8 hours of sleep, the person often only ends up with 6 or 7 hours of sleep when the alarm goes off in the morning. Apple wants to help make sure Apple Watch users get adequate sleep.