When you think about quality sleep, it’s natural to focus on how many hours you manage to get. Duration is key, but it isn’t the only part of the equation.
Pay attention to whether those 7 or 8 hours are truly restorative. Every night, we enter the same sleep cycle, in which different stages alternate. But if sleep isn’t of good quality, we often experience the same cycle restarting several times during the night, which...you guessed it—doesn’t lead to deep, restorative sleep.
Each stage of the sleep cycle plays an important role for the mind and body, helping you wake up refreshed. Understanding this cycle will help you assess whether you need to work on certain things to ensure restorative sleep.
What is a sleep cycle?
Over the course of the night, you pass through several stages of sleep, with one cycle usually lasting 90 minutes. Once you pass through all the stages, the cycle starts over.
Stage 1:
The shortest stage, lasting between 1 and 7 minutes. The body is not completely relaxed, but its activity, as well as that of the brain, begins to slow down. Unless someone wakes you, you will easily move on to stage 2.
Stage 2:
It lasts between 10 and 25 minutes. The body enters a “muted” state: its temperature drops, the muscles relax, and breathing and heart rate slow down. At the same time, the brain waves show a new pattern and eye movement stops. Overall, brain activity decreases, but brief bursts of activity occur, which actually help prevent you from being awakened by external factors—noise, light, and so on.
Stage 3:
This is a deep stage of sleep lasting between 20 and 40 minutes. It would be difficult to wake someone easily during this stage. The pulse, heart rate, and breathing rate drop even further.
Brain activity follows a pattern that is more difficult to detect—delta waves. Experts believe that this stage is critically important for restorative sleep, strengthening the immune system, and other key processes in the body. Although brain activity is low, there is evidence that deep sleep supports creativity, memory, and problem-solving.
You spend the most time in deep sleep during the first half of the night.
REM
During REM sleep, brain activity begins to increase, reaching levels close to those seen while awake. At the same time, the body experiences atonia, which is temporary muscle paralysis, with two exceptions: the eyes and the muscles that control breathing. Although the eyes are closed, they can be seen moving rapidly, which is where the name of this stage comes from.
REM sleep is believed to be essential for functions such as memory, learning, and creativity. It is best known for being the stage when the most vivid dreams occur, which explains the significant increase in brain activity. You can dream during any stage, but dreams are less common and not as intense during non-REM periods.
Why are sleep stages important?
Each one has its own function and allows the body and brain to develop and recover. Being unable to get enough deep sleep and REM sleep can lead to poorer focus, a loss of emotional control, and the physical effects of sleep deprivation.
What affects sleep stages?
Age: sleep stages differ greatly between adults, middle-aged people, children, and newborns. The latter spend significantly more time in REM and may enter it directly upon falling asleep. Older people, on the other hand, spend less time in REM
Recent changes in sleep patterns: if you do not get enough quality sleep for several days in a row, your sleep cycle will become disrupted and abnormal.
Alcohol: it reduces REM sleep early in the night, and when its effects wear off, REM sleep catches up with long REM phases.
Environment: too hot, too cold, noisy, or uncomfortable—whatever applies to you, you can usually correct it relatively easily.
Sleep disorders: sleep apnea, RLS, and other conditions that cause multiple awakenings
How can you take care of your sleep?
Although we do not have complete control over our sleep stages, there are several things that can contribute to deep and healthy rest.
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