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If your woken from deep sleep but can go back into a light sleep, you will find it easier to wake from a light sleep.

如果你从深度睡眠中醒来了，但可以重新回到轻度睡眠中，你会发现从轻度睡眠中醒来更容易。

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This beautiful room is bathed in light. You'll wake up every morning in a good humor.

这个漂亮的房间沐浴着阳光，每天早上醒来时你就会有个好心情。

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In another experiment the researchers wake up sleeping mice by sending a light signal to the hypothalamus, the brain's controller of sleep-wake cycles.

FORBES: Magazine Article

When a neutrino interacts in the NOvA detector , the particles it produces leave trails of light in their wake.

ENGADGET: NOvA neutrino detector captures cosmic rays in 3D, aims to unlock the mysteries of the universe

"It doesn't matter if you're asleep or whatever, you'll wake up and you'll see that red light, and you'll look at it, " Taylor says of his BlackBerry.

CNN: Why we can't unplug on vacation