Sleep

Professor SN Braynes (1958) conducted experiments on the old, decrepit dogs completely. The author describes a 15-year-old lap-dog (the age limit for this species) after 3 months of treatment with prolonged sleep with sleeping pills.
The dog had improved the general condition, disappeared many of the symptoms of senility, increased muscle tone legs, began to grow new hair, vocstanovilsya and remained until the end of life the sexual instinct, many biologically important functions were restored.
The dog lived for 6 years and at the age of 21.5 years, was accidentally killed by a chimpanzee.

These experiments were not confirmed by other authors in the literature and generally not found such evidence. Careful analysis of other studies of SN Braynesa showed that "the phenomenon of rejuvenation" was observed due to the fact that the author prior to the experiments of old animals to different aging effects. Such errors are found by other authors, when some pathological changes (temporary, recoverable) are accepted for age (senile).

Statistical demographic data indicate a minimum mortality rate of people with sleep duration of 7-8 hours. This is due to the fact that many of the biorhythms of the body are synchronized with the sleep-wake cycle. With age, there is a spontaneous desynchronization of biorhythms, and normal sleep is a synchronizing factor.
The maximum mortality rate of people in fall and winter. It is known that sleep is shorter in the spring and longer in the fall. Therefore justified the traditional mode of centenarians: get up after sunrise and after sunset to go.

The largest number of seats longevity is observed around 10 ° north latitude, that is in an area where there is not much change during the year the value of duration periods of the day or night.