Research Background Of Sleep Machines

Sleep is a daily occurrence for humans, yet our understanding of it is pitifully limited. Ancient humans not only lacked understanding of sleep but also feared it, dreading the thought of never waking up. With advancements in medicine, scientists have discovered that the human body and its physiological processes do not cease during sleep; rather, various physiological activities different from those during the day take place during sleep.

 

To adapt to different physiological needs, what appears to be a peaceful night's sleep is actually a turbulent process. Sleep actually comprises several cycles, each of which can be divided into several stages. After a long day, people go to bed feeling tired, close their eyes, and their bodies gradually relax, while brain activity slowly quiets down. After a period of stillness, the brain's nerves transition from the "sleep onset" stage of light sleep to the "deep sleep" stage, where the brain is unaware of external stimuli.

 

Scientists can monitor brainwave activity during deep sleep using instruments. It turns out that during the process of falling asleep, brainwaves gradually slow down, progressively entering the core phase of sleep. Sometimes, a person's brainwaves suddenly accelerate, their eyes begin to dart rapidly from side to side, and a series of vivid dreams appear in their mind. At this time, the sleeping person enters a very special "rapid eye movement (REM) stage." After a while, the dream dissipates, the brain returns to a resting state, and sleep enters the next cycle. Sleep cycles in this way throughout the night, and the physiological changes during this period are sometimes even more intense than during the day.