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Seventeen hours of sustained wakefulness leads to a decrease in performance equivalent to a blood alcohol–level of 0.05%. |
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As children grow older, they need less sleep. The following list shows you approximately how much sleep children of different ages need: Ages 1 to 4: 11 to 14 hours, Ages 5 to 9: 10 to 11 hours, Ages 10 to 14: 9 to 10 hours, Age 15 or older: 8 to 9 hours |
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Anything less than five minutes to fall asleep at night means you're sleep deprived. The ideal is between 10 and 15 minutes, meaning you're still tired enough to sleep deeply, but not so exhausted you feel sleepy by day. |
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One of the best predictors of insomnia later in life is the development of bad habits from having sleep disturbed by young children. |
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Experts say one of the most alluring sleep distractions is the 24–hour accessibility of the internet. |
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The record for the longest period without sleep is 18 days, 21 hours, 40 minutes during a rocking chair marathon. The record holder reported hallucinations, paranoia, blurred vision, slurred speech and memory and concentration lapses. |
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Some scientists believe we dream to fix experiences in long–term memory, that is, we dream about things worth remembering. Others reckon we dream about things worth forgetting — to eliminate overlapping memories that would otherwise clog up our brains. |
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No–one knows for sure if other species dream but some do have sleep cycles similar to humans. |
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Diaries from the pre–electric–light–globe Victorian era show adults slept nine to 10 hours a night with periods of rest changing with the seasons in line with sunrise and sunsets. |
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