In the video, we mentioned that the drive to sleep is triggered by internal and external cues. Internally, our awake brain receives accumulating signals that it is time to shut down (sleep pressure) and externally, environmental cues from daylight works with our biological clock to keep us synced into day/night cycles. What are some factors that contribute to throwing off our circadian rhythm and our sleep-inducing signals? Staying up late, waking up too early, having artificial light (cell phones) at night, are all factors that throw off our biological clock. Caffeine and other stimulants can delay the signals reaching our brain, telling us it's time to sleep.

For ideas about how to remedy those sleepless nights, visit the Sleep Disorders Center at UCLA and find out more about circadian rhythms and what disturbs them. Like to sleep with the light on? Maybe it's not such a good idea. Find out by reading Scientific American's article: Why Is Blue Light before Bedtime Bad for Sleep?

Teenagers are especially vulnerable to sleep deprivation. Visit this site and find out what some side effects are and what can be done to alleviate sleepless nights!

For more on sleep, take a look at this TED Ed lesson on the topic: The benefits of a good night's sleep by Shai Marcu. Then, go to the TED Talk playlist: Talks to inspire you to get a good night's sleep! Now get to bed, sleep tight, and catch some zzzzzzz's!

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