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Stages of Sleep Order


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Stages of Sleep Order

Sleep is essential in every human routine. It accounts for one-third of the person’s lifespan. We know this because every day, we are likely to feel drowsy and energized at almost similar times. Circadian rhythm is an internal clock running 24-hours in our cycles and brain between alertness and sleepiness at consistent intervals. Part of the humans’ hypothalamus controls the circadian rhythm. Furthermore, other factors, like darkness and lightness, can also affect sleep. A person’s circadian rhythm functions well when someone has consistent sleep habits such as sleep at night and wake up in the morning at the same time every day.

There are five stages of sleep, which are classified into two, including; non-rapid eye movement and rapid eye movement (Kanda, Miyazaki, & Yanagisawa, 2020). In stage one, there is a muscle slow down activity; at this stage, one may be waken- up and fail to notice if he was asleep; through this stage, the eyes are shut. Stage two develops light sleep, and the heart rate and body temperature slow down. Stages three and four a person experiences deep sleep. However, in the fourth stage, sleep is deeper. Then there is a repeat of stage two and three afterward. Stages one to four are known as non-rapid eye movement (Kanda, Miyazaki, & Yanagisawa, 2020), which lasts for 90 minutes. Stage five is the rapid eye movement; this is the stage whereby blood pressure rises, and the body temperature increases. A person might end-up taking all the five stages per night.

Scientists began to see the brain being active and working during the night when a person is asleep and also when dreaming. The study of EGG led to scientists identifying various stages of sleep, including rapid eye movement, with its exceedingly variable and active brain activity (Kanda, Miyazaki, & Yanagisawa, 2020). EGG is the best common tool used in the laboratory by scientists to spot the brain during sleep.


Kanda, T., Miyazaki, T., & Yanagisawa, M. (2020). Imaging Sleep and Wakefulness. In Make Life Visible (pp. 169-178). Springer, Singapore.