Millions of people fail to get the recommended seven to eight hours of sleep a night, and one study revealed that along with tight work deadlines, a bad night’s sleep was one of the top two factors that upset people’s daily moods. Another study suggested that getting one extra hour of sleep each night would do more for a person’s daily happiness than getting a $60,000 raise. Nevertheless, the average adult sleeps only 6.9 hours during the week, and 7.9 on the weekend—20 percent less than in 1900. Although people adjust to feeling sleepy, sleep deprivation impairs memory, weakens the immune
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