They are called acute, early chronic and late chronic stages. The acute stage lasts 1 day and the early chronic stage seems to last 3 weeks at least. During the acute stage the ability to desynchronize the EEG, either spontaneously or in response to sensory stimulations, is dramatically ...
2.1Sleep Stages Over a 24-h period, the human body continually cycles through states of wake and sleep (Savis, 1994). The fluctuation of sleep states enables the body to recover and renew from prior wakefulness enabling an individual to awaken feeling fresh and alert (Davenne, 2009; Santos ...
While in laboratory animals, NREM sleep can be sub-divided into light and deep sleep, in relation to the amount of EEG slow wave (delta) activity in each epoch, in humans, NREM is classified into three sub-stages. N1 is a transitional state from wakefulness, N2 is characterized by k-...