This paper examines the relationship between circadian rhythms and sleep deprivation. It begins by explaining the biological mechanisms behind the body's internal clock, including the role of the suprachiasmatic nucleus (SCN), the hypothalamus, and melatonin in regulating the sleep-wake cycle. The paper then describes how disruptions to circadian rhythms produce sleep disorders and their common symptoms. Drawing on a personal sleep deprivation assessment, the author reflects on their own sleep challenges. The paper concludes with seven practical, evidence-based strategies recommended by the Mayo Clinic for achieving more consistent, restorative sleep.
Circadian rhythms are normal changes in mental and physical characteristics that occur over the course of a day. The majority of circadian rhythms are controlled by the body's biological clock. As explained by the National Institute of Neurological Disorders and Stroke:
"This clock, known as the suprachiasmatic nucleus or SCN, is in fact a pair of pinhead-sized brain structures that jointly contain about 20,000 neurons. The SCN rests in a part of the brain called the hypothalamus, which is located just above the point where the optic nerves cross. Light that reaches photoreceptors in the retina creates signals that travel along the optic nerve to the SCN. Signals from the SCN travel to several brain regions, including the pineal gland, which responds to light-induced signals by switching off production of the hormone melatonin. The body's level of melatonin normally increases after darkness falls, making people feel drowsy and ready to sleep" (Brain Basics: Understanding Sleep, 2007).
A person who suffers from circadian rhythm sleep disorders is typically sleep deprived. All such disorders involve problems with the timing of when a person sleeps and when they are awake. A person's internal clock controls the regulation of body rhythms such as temperature and hormone levels, and the primary rhythm this clock manages is the sleep-wake cycle. The circadian clock operates on a cycle that lasts slightly longer than 24 hours and is set mainly by visual light and darkness cues communicated along a pathway from the eyes to the SCN, which keeps the clock coordinated to the 24-hour day. Circadian rhythms and their sensitivity to time cues may also change as a person ages.
Each circadian rhythm sleep disorder involves difficulty falling asleep, struggling to stay asleep, waking up frequently during the night, waking up too early with an inability to return to sleep, and experiencing poor-quality sleep overall (Circadian Rhythm Sleep Disorders, 2008).
The results of the sleep deprivation assessment (Carpenter & Huffman, 2009) were very accurate — I am definitely sleep deprived. Not only did I find it difficult to trace the star during the motor task, I also answered yes to almost all of the questions in Part 2. I find that I could fall asleep almost anywhere, but especially after eating or when trying to relax. I am usually asleep within minutes of going to bed, yet I struggle considerably to get up in the morning. On a daily basis, I find myself stressed just to get through the day without feeling tired, irritable, and drowsy.
According to the Mayo Clinic's sleep tips (2012), there are seven steps one can use to achieve better sleep:
Stick to a regular sleep schedule. Going to bed and getting up at the same time every day — even on weekends, holidays, and days off — reinforces the body's sleep-wake cycle and helps promote better sleep at night.
"Author's self-assessed sleep deprivation results"
"Seven Mayo Clinic steps for better sleep"
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