Humans spend about a third of their lives sleeping, although some people manage on much less. Thomas Edison believed that sleep was a waste of time. However, research shows that sleep deprivation can have serious consequences on memory, concentration, behaviour, mood, judgement and on overall health.
Although the recommended length of adult sleep is 9 hours, the average is 7.75 hours. However, no one sleeps this long without interruption. In any sleep cycle, there will be periods of light and deep sleep followed by active sleep. At the end of active sleep, the sleeper wake ups, but if undisturbed will drift back to sleep again.
Adults have at least five cycles of sleep at night, with each cycle lasting about 90 minutes. Babies follow a similar pattern, but their sleep cycle lasts between 50 and 60 minutes. Generally, the length of the sleep cycle increases with age.
For the full article click follow this link: Baby Sleep.pdf
By Dr Lin Day (founder of Baby Sensory, Hello Baby, and Toddler Sense)