Sleep for around 14 hours per day but not continuously as infants do not have 90 minute sleep cycles. Quiet and active sleep - half of this is active. Period of light sleep before quiet sleep. By 6 months, a circadian rhythm is established.
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Childhood
Age of 5, EEG pattern similar to an adult.12 hours with 30% = REM. Sometimes there are parasomnias.
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Adolescence
Sleep for 9-10 hours, may have phase delay.
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Adulthood
Eight hours per night with 25% REM. May be insomnia/sleep apnoea
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Old Age
More difficulty getting to sleep/wake up. REM to 20% and SWS to as little as 5% - phase advance.
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