Everything You Must Know About Sleep Cycles
We spend one-third of our lives sleeping. It is a natural bodily process that helps our body and brain to rest. People only consider the hours and duration they sleep. However, the duration is not the only important thing. You must consider the sleep quality and whether sleep was refreshing.
We all love to sleep and escape from this world for some time, but have you ever wondered what actually happens when you fall asleep? Why does sleep sometimes make you energetic and sometimes make you wake up irritated?
The answer lies in sleep cycles.
It is really crucial to understand sleep cycles because they will change the way you rest, improve your productivity, and boost your mental health.
Sleep is not a single continuous state. While you are sleeping, you go through several rounds of a sleep cycle composed of 4 stages. Usually, a person completes 4 to 6 sleep cycles each night. The average length of one sleep cycle is 90 minutes. Each cycle includes different stages of sleep, and each stage plays a different role in physical recovery, memory consolidation, and emotional regulation.
There are actually 4 phases of sleep: one for rapid eye movement (REM) sleep and three that form non-REM (NREM) sleep. These stages differ on the basis of brain activity and different patterns in each stage.
This is the transition phase between wakefulness and sleep, which occurs when a person falls asleep. It usually lasts about 7 to 10 minutes.
In this stage, muscle activity slows down, the brain slows down, shifting from alpha to theta waves, eyes move slowly, you may feel like you are drifting, and sometimes you experience a hypnic jerk.
In this stage, you are not usually asleep yet, and therefore, it is easy to wake someone up in this stage. This stage can be considered the body’s warm-up stage for deeper sleep.
This stage makes up 50% of your entire sleep time. In this stage, the body is in a muted state. The heart rate slows down, body temperature drops, brain activity slows more with brief bursts of activity, and breathing becomes steady. It lasts for 20 to 25 minutes in the first sleep cycle.
Your body prepares for deep restorative sleep. At this stage, it becomes a little hard to wake someone up.
In this stage, it is really hard to wake someone up from sleep, as this is the most restorative stage of sleep.
In this stage, blood pressure drops, muscles relax, tissue growth and repair occur, the immune system strengthens, growth hormones are released, and delta waves dominate your brain activity. Moreover, this stage enhances your creativity and memory.
If someone wakes you up from this stage, you may feel groggy; that is, sleep inertia. Without deep sleep, you will be exhausted no matter how much time you stay in bed. This stage is crucial for physical recovery, muscle repair, energy restoration, and strong immunity.
It is the stage of the most vivid dreaming. In this stage, brain activity becomes highly active, eyes move rapidly under closed eyelids, breathing is irregular, the heart rate increases, and muscles are temporarily paralysed, which is called atonia.
You can enter the stage after you have slept for almost 90 minutes. REM is important for memory consolidation, learning, emotional processing, and creativity. Also, REM periods get longer with each cycle throughout the night.
Every stage in the sleep cycle matters, as they help the brain and the body to refresh and recover. If you are unable to get REM and NREM sleep, it will affect your thinking, emotions, and physical health.
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Insomnia.
Sleep apnea.
Restless leg syndrome.
Narcolepsy.
Screen time before bed
Stress and anxiety.
Irregular sleep schedule.
There are many ways to optimize your sleep.
You must go to bed and wake up at the same time daily.
Stop using any screen at least 1 hour before bed.
It is easy to fall deep into a dark room with a cool temperature and minimal noise.
Avoid coffee and energy drinks after 4 pm.
Deep breathing, light stretching, reading, and meditation.
Sleep cycles are not just random but a way towards a healthy, productive, and stable life.
You must take care of your sleep cycle as it influences your thinking, energy, memory, immunity, and mood.