The person carries out a third of the life in a dream. This state is necessary for recuperation, rest and also for normal work of mentality – more precisely, spheres unconscious. The dream and an animal is necessary.
The normal duration of a dream – the phenomenon individual, and still it is possible to track certain trends. Duration of a dream is not identical at different species, and within one look varies depending on age.
People
Dream duration at people decreases with age.
Most of all time is spent in a dream by a fruit in mother's womb – from 85% to 90% of time. By means of encephalograms the scientists established that in pre-natal life other ratio of phases of a REM and slow sleep is observed: each of them takes about 50% of time, at adult people duration of a REM sleep is less than 20%.
Much also newborns sleep – in sheathe difficulties till 18 o'clock in day. By 3-4 months duration of a dream decreases till 17 o'clock, to 5-6 – to 16, to 7-9 – up to 15, and one-year-old children sleep no more than 15 hours. From a year to one and a half years the child sleeps 10-11 hours at night and twice in the afternoon 1.5-2 hours in the afternoon, half of one and a half years there is one daytime sleep. After 7 years children cease to sleep in the afternoon, and sleep 8-9 hours at night. Duration of a dream decreases also in an adult state. The English researchers from the University of Surrey established that 20-30 summer people sleep on average 7.23 hours, 40-55 summer – 6.83, and people are more senior than 60 years – 6.51. Thus, the young man, the more he sleeps.
Animals
Speaking about dream duration at various animals, it is not necessary to remember bears, hedgehogs and other animals who fall into hibernation for the winter. Hibernation which scientifically is called hibernation differs from a dream: body temperature of an animal decreases by several degrees, heartbeat, breath and other physiological processes slows down – at a usual dream of it does not happen. It will be a question of a daily dream, but not of hibernation. In the people "champion" on dream duration the cat traditionally is considered. Not accidentally songs so often appears in lullabies "kotya-kotinka-kotok": was considered that this animal has to "teach" the child to sleep. The true champion on duration of a dream was established by the Swiss zoologist P. Hodiger. It is remarkable that the representative of the cat family – the African lion was "champion". This predator sleeps till 20 o'clock in day. The lion is able to afford such long dream – it practically has no natural enemies. Idlers – the animals from group of primacies living in Central and South America rank second. They sleep from 15 to 18 hours a day.