BIOLOGICAL BASES OF BEHAVIOR
BIOLOGY OF CONSCIOUSNESS
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Detailed explanation-1: -Sleep occurs in five stages: wake, N1, N2, N3, and REM. Stages N1 to N3 are considered non-rapid eye movement (NREM) sleep, with each stage a progressively deeper sleep.
Detailed explanation-2: -Stage 5: Non-REM Sleep Stage five is the final stage of sleep where we begin to dream, and it occurs about 90 minutes into the sleep cycle. The eyes move rapidly, breathing becomes shallow and rapid, and blood pressure and heart rate increase.
Detailed explanation-3: -These four sleep stages are called non-rapid eye movement (non-REM) sleep, and its most prominent feature is the slow-wave (stage IV) sleep. It is most difficult to awaken people from slow-wave sleep; hence it is considered to be the deepest stage of sleep.
Detailed explanation-4: -Not all sleep cycles are the same length, but on average they last about 90 minutes each.
Detailed explanation-5: -Each stage can last from 5 to 15 minutes. You go through all three phases before reaching REM sleep.