"Jingle bell......"How many alarms do you have to turn off every morning to get out of bed? After being woken up by the alarm clock, will you feel dizzy, fast heartbeat, and feel bad? So, what are the effects of being constantly woken up by an alarm clock? Why is being woken up by an alarm clock so annoying? Let's find out. Why is it so painful to be woken up by an alarm clock? People usually go through cycles of several sleep cycles. Within each sleep cycle, three more stages are processed:Light sleep, deep sleep, REM period.
Light sleep stage,It is also the stage when we are most likely to wake up. This phase usually lasts only a few minutes, and during light sleep, the muscles gradually relax, and the breathing and heart rate slows down slightly, allowing you to move on to the next stage if you are not disturbed. At this stage, people will be disturbed by some slight noises and vibrations.Deep sleep stage,It will make people sleep deeply, their heart rate and breathing rate will be at a minimum, and the body will be completely relaxed. At this stage, it is usually difficult to be woken up.
Subsequently, sleep will enterREM period,Your breathing and heart rate will increase at this time, and if someone is staring at you at this time, you will notice that your eyeballs are rolling back and forth under your closed eyelids. At this point, the neurons in the brain are actually as active as they are when they are awake, and the body is completely relaxed. Dreams happen in this process.
Natural waking often occurs after the REM period, when the brain is almost awake and only needs the body to keep up, and it can quickly move from a sleeping state to a waking state. In addition, since we go through several sleep cycles in one night, sometimes we wake up in light sleep, when the brain and body are not in a state of complete sleep, and we don't feel bad when we wake up. But waking up from an alarm clock is different, what sleep stage we are in when it goes off is completely random, if we happen to be in a deep sleep stage, or are dreaming, we will not be very comfortable when we wake up. 
Some studies have found that if you are awakened by an alarm clock in deep sleep, your short-term memory, cognition and other aspects will be worse within two hours after waking up, and your exercise ability will also be affected. It can also cause the brain to accumulate more sleepy adenosine, making us wake up groggy and even wake up chaotically, the so-called "wake-up gas" is one of them. If the sleep quality is good, people will be fully awake after a few minutes, but if they sleep not well, it may take a few hours for this state to disappear. What can be done to change this? Researchers have found that different alarm clock sounds can significantly affect people's sleep inertia after waking up. Soft**, natural sounds, white noise, melodic **, or personal favorite** are more suitable as alarm clock audio. 
When choosing an alarm audio, you can follow a principle: whether the intro is melodious, and the afternote is gradually agitated. This change is mainly through the slow increase of the voice, the slow spiraling of the melody, and the gradual awakening of the body. According to research, the moment you wake up by a strong alarm clock, your blood pressure rises sharply, your heart beats violently, and your body instantly enters a tense state. Although blood pressure and heartbeat slowly recover after waking up, it is really uncomfortable to come here every morning. There are certain health risks for people who are easily frightened and have related problems. 
So, if you must wake yourself up with a sound alarm clock, you might as wellChoose something gentler and soothing. What time do you wake up every dayHow do you set the alarm clock?
Let's talk in the message area! ** Popular Science China.
Edited by Liu Bin.
Reviewed and signed by Ming Fang.
Executive Producer: Qiao Hong.