Sleep 18

Sleep - The Enigma of our Consciousness

8 min read

Simon Körösi

Reviewed by: Joanna Elmes

The Issue


We devote approximately a third of our lives to sleep, yet the science underpinning this seemingly effortless activity remains largely elusive. We understand that sleep is essential for our physical and mental health, but the persisting question is: why do we sleep?

For a lengthy period, the answer was ambiguous. Researchers held the belief that sleep was simply a passive state, a moment when the body could rest and recuperate. Nevertheless, recent research has unveiled that sleep is an active process which plays a crucial role in numerous physiological functions, such as memory consolidation, hormone production and regulation of our immune system.

Moreover, sleep is vital for promoting a healthy circadian rhythm — the internal clock that modulates our sleep-wake cycles.


The Science


Dr. Charles A. Czeisler, a professor of sleep medicine at Harvard Medical School and the head of the Division of Sleep and Circadian Disorders at Brigham and Women’s Hospital in Boston, maintains that sleep is one of the most vital aspects individuals can prioritise to improve their overall well-being .


"Sleep is pivotal for physical and mental health, and persistent sleep deprivation can instigate a wide array of negative impacts, from impaired cognitive function to an escalated risk of chronic illnesses such as diabetes and heart disease."


Indeed, the ramifications of sleep deprivation can be drastic. Chronic sleep deficit has been associated with an elevated risk of obesity, diabetes, cardiovascular disease, and even premature mortality. Lack of sleep has also been proven to hinder cognitive function, including memory, attention, and decision-making.

In providing this information, my aim is to educate and motivate, offering an informative and authoritative perspective whilst maintaining an approachable and conversational tone. My style underscores knowledge, empathy, and professionalism with a strong focus on promoting well-being and personal choice

But how does sleep impact our health, and why is it so crucial? Scientists have unveiled a host of functions that occur during sleep, including cellular repair and regeneration, brain plasticity, and waste clearance. In fact, a study conducted at the University of Rochester Medical Centre found that the brain actually diminishes in size during sleep, facilitating cerebrospinal fluid's ability to flush out toxins and metabolic waste that accumulate during waking hours.

Despite the burgeoning body of evidence supporting the importance of sleep, there are still many enigmas surrounding this essential function. For instance, the exact mechanisms behind sleep and the brain's need for rest remain obscure. In a recent interview, Nobel Prize laureate in the field of circadian rhythm and Yale University professor Dr. Michael H. Rosbash commented:


"We don't yet comprehend the full scope of reasons why the brain needs to sleep, but it's evident that we can't manage without it."


Scientists are also scrutinising the effects of sleep on mental health. Recent studies have associated sleep disturbances, such as insomnia, with an increased risk of developing depression and anxiety. However, the precise relationship between sleep and mental health remains nebulous. Dr Michael Basner, director of the Behavioural Sleep Medicine Programme and a professor of Sleep and Chronobiology at the University of Pennsylvania, observes:


"We still have a great deal to learn about how sleep impacts mood and the regulation of emotions. It's a complex interaction between biological, psychological, and environmental factors."


Another realm of sleep research gaining momentum is the influence of technology on our sleep. With the proliferation of smartphones, tablets, and other electronic devices, many of us are exposed to artificial light and blue light, which can disrupt our circadian rhythms and inhibit the production of melatonin, a hormone that regulates sleep. A recent study conducted by the National Sleep Foundation discovered that nearly 90% of adults use electronic devices in the hour before bedtime, and a significant number of them report experiencing sleep disturbances as a result.

For many men, achieving a good night's sleep can often seem like a distant dream, and it's frequently an underappreciated aspect of their overall health. Despite the indisputable fact that sleep is essential for our physical and mental well-being, men are more inclined to forfeit sleep in favour of work, social engagements or other commitments.

Nonetheless, research indicates that this disregard for sleep can have significant repercussions on men's health. Sleep deprivation has been associated with decreased testosterone levels, indirectly impacting muscle mass, bone density, and overall physical performance.

Dr Ranjana Advani, a sleep specialist at Stanford Health Care, sheds light on the subject, explaining:


"Testosterone levels peak during deep sleep. When men don't achieve sufficient sleep, their testosterone levels can diminish, potentially leading to an array of health issues, including erectile dysfunction, reduced muscle mass, and decreased bone density."


Despite the burgeoning body of evidence underscoring the importance of sleep, many men persistently grapple with sleep-related problems. Insomnia, sleep apnea, and other sleep disorders appear to be more prevalent in men than in women. This may, to some extent, be attributable to lifestyle factors capable of disrupting sleep patterns, such as:



Alcohol intake


Insufficient physical activity


However, there are measures men can adopt to enhance their sleep quality and overall health, encompassing:


Maintaining a regular sleep schedule


Avoiding caffeine and alcohol the hours before bedtime


Creating a sleep-conductive environment by keeping the bedroom cool, dark, and quiet

So, is greater comprehension of what aids and what obstructs us from achieving optimal sleep the key to improved sleep quality in men?

Dr Advani highlights the need to understand sleep but also to actively strive for improvements: 


"Sleep is a crucial process that impacts every facet of our health and well-being. Men must grasp the importance of sleep and take proactive steps to guarantee they're attaining sufficient quality sleep."


What next?


Despite the hurdles, sleep research is making strides at a blistering pace. It remains to be seen whether a deepened understanding of sleep alone could yield sufficient lifestyle changes, yet it's clear we could certainly benefit from some assistance.

New technologies, such as wearable devices that monitor sleep patterns, are delivering invaluable insights into the mechanics of sleep and the ramifications of sleep disturbances on our health. Dr. Rosbash observes:


"The thrilling aspect of sleep research is that we're barely at the tip of the iceberg. There's a vast amount we're yet to comprehend about why we sleep, how sleep intertwines with our biological processes, and how it affects our holistic health and well-being. Given the constant emergence of new tools and technologies, I remain hopeful that we'll keep making groundbreaking discoveries in the realm of sleep science."


As we persist in unravelling the mysteries of sleep, it's evident that this fundamental function is far more intricate and multifaceted than we ever envisaged. As Dr. Basner puts it:


"Sleep is an indispensable process that influences every facet of our health and well-being. We owe it to ourselves to make it a top priority."