Some people fall asleep easily because their bodies know it's time to rest. Like a bedtime story, their brain gets sleepy signals from special chemicals called melatonin. Others are still thinking about the day, like leaving a party and trying to remember everyone’s names, so they can’t shut off their brains as quickly.
The Sleep Signal
When it gets dark outside, your body starts making melatonin, which is like a magic sleepy pill. If you’re calm and relaxed, that signal reaches your brain faster, and sleep comes easily. But if you're still excited or stressed, the signal takes longer to work its magic.
Examples
- At the playground, Tommy runs around on the swings and slides for a long time, then lies down on the grass and falls asleep almost instantly, like he turned off a light switch. But Lucy only played for a little bit, and even though she’s tired, her brain keeps thinking about her favorite toy, so she can’t fall asleep as quickly.
- In the kitchen, Mom asks both Alex and Sam to clean up their toys before bed. Alex finishes fast and goes to bed right away, because he didn’t have much energy left. But Sam kept playing with his blocks even after cleaning up, so his brain was still excited and he had trouble falling asleep.
- At bedtime, Jake’s brother reads him a story, and Jake closes his eyes and is asleep in no time. But his sister listens to the same story, but her mind keeps thinking about what she wants for breakfast tomorrow, so even though she’s tired, it takes her longer to fall asleep.1. At the playground, Tommy runs around on the swings and slides for a long time, then lies down on the grass and falls asleep almost instantly, like he turned off a light switch. But Lucy only played for a little bit, and even though she’s tired, her brain keeps thinking about her favorite toy, so she can’t fall asleep as quickly.
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See also
- How Do Our Bodies Know When to Sleep and When to Wake Up?
- How Does the Moon Affect Our Sleep?
- What Causes the Different Kinds of Sleep Patterns?
- Why Do People Have Different ‘Sleep Cycles’?
- What Makes Some People ‘Night Owls’ and Others ‘Early Birds’?
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