How Do Phones Know When You're Tired?

Phones have special helpers inside them called sensors that can feel your movements. When you're falling asleep, you stop moving a lot, like when you're on the edge of sleep and you’re just dozing off. Your phone notices this and says, 'Hey, they must be tired!' It’s like how your parents know when you're pretending to be asleep.

Take the quiz →

Examples

Your phone can tell if you're falling asleep by counting how many times you move before stopping.
If you lie still on your bed at night, your phone might say you're going to sleep soon.
When you start snoring, your phone feels it and knows you’re in a deep sleep.

Ask a question

Discussion

Recent activity

Categories: Technology · smartphone· sleep tracking· health technology· machine learning· sensor technology