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How Smartphones Keep You Awake

Key Facts In This Video

  1. Light is one of the best biological cues we have to the time of day, and blue light is particularly effective in helping us predict when morning is. 00:28

  2. Intrinsically photosensitive retinal ganglion cells (ipRGCs) collect light just like other eye cells, but they pass the light information to your brain's master clock instead of its visual system. 01:07

  3. You can help yourself sleep by eating at the right times of day, shutting off screens well before going to sleep, and going to sleep when you're tired. 01:55