Being startled out of sleep by an alarm clock causes a spike in noradrenaline levels, making dreams harder to remember.

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Why Do We Yawn?

According to some very attentive researchers, human beings tend to yawn about eight times per day. That number is probably larger if the day is spent with other people who yawn, or if it’s spent, say, reading an article about yawning. (Are you yawning yet?) The visual of someone yawning, or even