The Importance of a Healthy Sleep Schedule

By: Ritisha Debnath

Editor: Shrinidhi

Getting good sleep is essential as it allows both the brain and body to function properly. During sleep, the body moves through structured sleep cycles that include non-REM stages (Stages 1, 2, 3) and REM (Rapid Eye Movement) sleep. Non-REM sleep helps the body repair tissues, strengthen the immune system, and restore energy, while REM sleep plays a key role in memory consolidation, learning, and emotional processing. These stages repeat several times throughout the night, and each stage has a specific purpose. When someone does not get enough sleep, these cycles are disrupted, which can affect focus, reaction time, and decision-making. Research from major health organizations like the National Institutes of Health (NIH)  and Johns Hopkins Medicine explains that sleep supports brain plasticity, meaning it helps the brain adapt and form new connections. This is especially important for students, since sleep improves attention, problem-solving skills, and long-term memory.

In addition to supporting brain function, sleep is critical for physical health. While sleeping, the body regulates hormones that control appetite, growth, stress, and metabolism. Poor sleep has been linked to an increased risk of heart disease, obesity, weakened immunity, and high blood pressure. Medical experts also emphasize that consistent sleep strengthens the immune system, helping the body fight off infections more effectively. Sleep also affects mood and mental health, as the lack of rest can lead to irritability, anxiety, and difficulty managing emotions. Over time, chronic sleep deprivation can negatively impact overall well-being and quality of life.

When you first fall asleep, you enter the non-REM stages before eventually reaching the REM phase. During Stage 1, it is easy to wake up, however, during stage 3, it gets harder. During the REM stage, normally, you should not be able to wake up or move, allowing yourself to dream the most.

Nightmares and night terrors happen more in stage 3. Each full sleep cycle (consisting of the 3 non-REM stages and the REM stage) is around 90 minutes long. At first, the non-REM stages are longer than the REM stages, but the longer you sleep, the more time you spend in your REM stage. REM sleep is the most important sleep you can get, therefore, it is advised by many researchers that you sleep around 8 hours to maximise your time in the REM stage.

Overall, sleep is not simply a time when the body shuts down; it is an active and essential process that supports nearly every system in the body. Each stage of the sleep cycle contributes to restoration, learning, emotional balance, and long-term health. Prioritizing healthy sleep habits—such as maintaining a regular sleep schedule and limiting screen time before bed—can significantly improve both mental and physical performance. Because sleep influences brain function, physical health, and emotional stability, it is one of the most important factors in maintaining a healthy and productive life.

Sources:

Why is sleep important? 9 reasons for getting a good night’s rest. (n.d.). Retrieved from https://www.medicalnewstoday.com/articles/325353 

(N.d.). Retrieved from https://www.hopkinsmedicine.org/health/wellness-and-prevention/the-science-of-sleep-understanding-what-happens-when-you-sleep 

Why is sleep important? (n.d.). Retrieved from https://www.nhlbi.nih.gov/health/sleep/why-sleep-important?

About sleep. (n.d.). Retrieved from https://www.nichd.nih.gov/health/topics/sleep/conditioninfo?

Health benefits of sleep. (2025). Retrieved from https://www.sleepfoundation.org/how-sleep-works/benefits-of-sleep?utm_source=chatgpt.com