Sleep is; Researchers have discovered a complex process controlled by the brain that operates according to a 24-hour biological clock.
Le fa go ntse jalo, babatlisisi ba tlhalositse gore go tshwarwa ke boroko ke thulaganyo e e raraaneng e e laolwang ke boboko, mme go direga ka tsela ya tlhago fela mo diureng dingwe le dingwe di le 24.