"Dysania" is the state of finding it hard getting up out of bed in the morning.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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Dieters who sleep more take off more fat that those who sleep less.
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Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
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People who sleep late have more mental stamina and can outperform early risers.
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44% of kids watch television before they go to sleep.
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