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Weather Affects Wakefulness
- Mammalian biology makes you prefer staying warm and dry when it's cold, rainy, or dark.
- Your body and brain weigh metabolic cost and light cues to decide whether to stay asleep.
Light Controls Your Body Clock
- Light detection via the retina informs the brain's suprachiasmatic nuclei about sleep timing.
- Even partial light before full wakefulness shifts your circadian rhythm toward waking.
Explain Gravity With Muscles And Contact
- Explain gravity to a child by focusing on muscles and contact instead of space-time.
- Demonstrate by asking the child to hold their arm up and compare it to jumping to show what supports you.