Could your body do with a spring cleanse? May 13, 2015 Articles, Liver Doctor's Articles Leave a comment 5,162 Views. Today we cannot escape environmental toxins as they are increasingly in the air, water, soil and, by extension, in the food we eat.
Sleep Stages. Periods of sleep manifested by changes in EEG activity and certain behavioral correlates; includes Stage 1: sleep onset, drowsy sleep; Stage 2: light sleep; Stages 3 and 4: delta sleep, light sleep, deep sleep, telencephalic sleep. Translation. Find a translation for the sleep stages definition in other languages:
Loomis provided the earliest detailed description of various stages of sleep in the mid-1930s, and in the early 1950s, Aserinsky and Kleitman identified rapid eye movement (REM) sleep. Sleep is generally divided into 2 broad types: nonrapid eye movement (NREM) sleep and REM sleep. Based on EEG changes, NREM is divided further into 4 stages (stage I, stage II, stage III, stage IV). NREM and REM occur in alternating cycles, each lasting approximately 90-100 minutes, with a total of 4-6 cycles.