Physically speaking, sleep is a complex process that involves the body adjusting itself to normal. People believe that sleep is important for the body’s processes, including the conversion of short-term memories into long-term memories (Memory Consolidation). Scientists do not have an explanation for why humans need to sleep. However, sleep is important for humans and all living things. People who have problems with sleep do not get enough rest. People who do not get enough sleep may have health problems that affect their bodies and moods.
Sleep is generally influenced by circadian rhythms, which are controlled by brain neurons. Brain neurons respond to light, temperature, and other signals, including the body’s internal clock, which helps regulate the sleep-wake cycle. If this cycle is disrupted, it can cause drowsiness or wake up at irregular times. For example, people who travel across time zones often experience jet lag, สนใจสมัคร? คลิกที่นี่เพื่อเริ่มต้น which can take several days to adjust to a different time zone, depending on the distance between the two time zones and the degree to which different organs recover.
There are two stages of sleep.
In addition, sleep also has different sleep stages, which are divided into 2 stages: normal sleep and dream sleep, as follows:
1. Normal sleep stage (Non-Rapid Eye Movement: NREM)
There are three levels of normal sleep, which depend on the patterns of electromagnetic wave activity in the brain:
- Stage 1 (Stage N1 Sleep) is the stage where the body changes from wakefulness to deep sleep. It is considered the first stage of sleep, and people are usually not aware that they are sleeping.
- Stage 2 (Stage N2 Sleep) is the stage when the body is in deep sleep, accounting for 40-50 percent of the sleep time.
- Stage 3 (Stage N3 Sleep) is the stage where the body is in deep sleep and sleepwalking may occur. It accounts for 20 percent of the sleep time for teenagers. Most people tend to sleep deeply in the first half of the night. This is also the period when the body releases growth hormone and other hormones. The body repairs tissue, builds bones and muscles, and strengthens the body’s immune system. Sleep during this stage is therefore very important.
2. Rapid Eye Movement (REM) sleep stage
People enter REM sleep after falling asleep for 90 minutes. This stage of sleep is different from other stages of sleep because brain waves during REM sleep have a fast frequency and low voltage, similar to those during wakefulness. Skeletal muscles do not move during sleep, except for the muscles that control eye movement. People who wake up from normal sleep are usually dreaming. This stage accounts for 20-25 percent of their sleep time, while infants may account for about 40 percent. REM sleep is a stage of sleep that is difficult to awaken. People who are awakened from this stage of sleep will quickly fall back to sleep. REM sleep is a stage when the brain works no less hard than when awake because the brain processes the various data it receives, organizing the data to create memories, understanding, and other information necessary for life.