Smartphones can tell when you're tired because they watch how long your eyes stay open and how much you move. When your phone sees you blink a lot or stop moving, it thinks you might be sleepy. It uses the camera on your phone to look at your face and even checks if you're using your phone less during the day.
Examples
- Your phone notices you're blinking a lot during your lunch break and suggests you take a short nap.
- When you're sitting in class and not moving for a long time, your phone thinks you might be sleepy.
- You stay on your phone past 10 p. m., so it assumes you’re not going to sleep soon.
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See also
- Why Do We Get 'The Runs' on Planes?
- How Does a Fridge Keep Food Cool?
- How Does a Smartphone Recognize Your Face?
- How Did the Internet Begin?
- Why Do We Use Passwords for Security?