Smartphones have tiny helpers inside them that track your activity and light levels. When it gets dark, or when you stop moving around a lot, the phone thinks you might be going to bed. It uses all this information to guess if you're tired.
Examples
- Your phone senses it's getting dark in your room, that might mean you're going to bed.
- You stop moving a lot, so your phone thinks you're tired.
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See also
- How Do Smartphones Know You're Taking a Photo?
- How Do Smartphones Know You're at the Airport?
- How Do Smartphones Know When to Vibrate?
- Why Do Smartphones Automatically Adjust to Light?
- How Does Your Phone Know You're Talking to It?
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Categories: Technology · smartphone· sensor technology· health tracking· mobile devices· wearable tech