How Do ‘Smartphones’ Know When to Wake You Up?

Smartphones can tell when to wake you up by using a special tool called sensors that feel your movement. If the phone senses you are still sleeping, it waits a bit before ringing. It’s like a sleepy friend who knows when to call you out of bed.

Take the quiz →

Examples

Your phone waits until you're almost awake before it rings.
You sleep through one alarm, and the next one wakes you right up.
Your phone feels when you're moving and decides to wait a bit.

Ask a question

Discussion

Recent activity

Categories: Technology · smartphone,alarm clock,sensors,technology,sleep tracking