Why Can’t I sleep? The Disruption of Our Natural Sleep-Wake Cycle

In today's fast-paced and technology-driven world, many of us find ourselves struggling with sleep-related issues. One major contributing factor is the disruption of our natural sleep-wake cycle, also known as the circadian rhythm. In this blog post, we will explore how our modern lifestyle has led to the loss of our innate sleep patterns. Additionally, we will delve into the biology behind the sleep-wake cycle and the hormones involved in regulating it.

can't sleep

Why do I struggle to sleep?

Our modern world bombards us with artificial light, irregular work schedules, and constant exposure to electronic devices, all of which can significantly disrupt our sleep-wake cycle. Artificial lighting, especially the blue light emitted by electronic devices, inhibits the production of melatonin, a hormone that regulates sleep. This interference confuses our internal clock, making it harder for us to fall asleep at the desired time.

Irregular work schedules, such as shift work or night shifts, further exacerbate the problem. Our bodies have evolved to align with the natural light-dark cycle, and forcing them to adapt to irregular sleep patterns can throw our circadian rhythm out of balance. This disruption can lead to difficulties falling asleep, staying asleep, and feeling refreshed upon waking.

The Biology of the Sleep-Wake Cycle:

Our sleep-wake cycle is regulated by the suprachiasmatic nucleus (SCN), a small region in the brain's hypothalamus. The SCN receives information about light exposure from the eyes and signals the pineal gland to produce or inhibit melatonin accordingly.

Melatonin, often referred to as the "sleep hormone," is crucial in regulating our sleep-wake patterns. It is released in response to darkness, promoting drowsiness and initiating the sleep process. When exposed to light, particularly blue light, melatonin production is suppressed, keeping us awake and alert.

Another hormone involved in sleep regulation is cortisol, often referred to as the "stress hormone." Cortisol levels follow a diurnal pattern, peaking in the morning to help us wake up and gradually decreasing throughout the day. However, chronic stress and irregular sleep patterns can disrupt this natural rhythm, leading to imbalances in cortisol levels and further impacting our sleep quality.


The modern world's influence on our sleep-wake cycle cannot be understated. Artificial lighting, irregular work schedules, and excessive exposure to electronic devices have disrupted our innate sleep patterns, leading to a host of sleep-related issues. Understanding the biology behind our sleep-wake cycle and the hormones involved, such as melatonin and cortisol, can help us make informed decisions to reclaim healthier sleep habits.

To improve our sleep quality, it is crucial to prioritise sleep hygiene by limiting exposure to electronic devices before bedtime, creating a sleep-friendly environment, and establishing consistent sleep routines. Read our blog 7 Sleep Hygiene Tips for Optimal Sleep and Well-Being to learn more about healthy sleep hygiene.

By consciously aligning our lifestyle with our natural sleep-wake cycle, we can restore balance, improve our overall well-being, and enjoy the restorative benefits of a good night's sleep.

Leave a comment

Name .
Message .