Our bodies have an incredible biological clock that operates on a daily 24-hour cycle. This is called the circadian rhythm, and a tiny area in the hypothalamus called the suprachiasmatic nucleus coordinates all these rhythms like an orchestra conductor. The SCN is particularly sensitive to light. When it receives morning sunlight, it sends a signal to our body that it is time to start the day, stimulating the secretion of cortisol, a hormone that wakes us up, and suppressing the secretion of melatonin, which induces sleep at night. Conversely, as light diminishes at night, it activates melatonin secretion to help us fall asleep comfortably.
Yet, modern life easily disrupts this delicate biological clock. The blue light emitted from smartphones or TVs late at night tricks our brain into thinking it is still daytime, interfering with melatonin secretion. Furthermore, irregular leaving times from work, shift work, and jet lag from frequent international travel throw the SCN into confusion. If the circadian rhythm remains broken over time, our bodies can face serious problems far beyond simply feeling tired.
The most common issue is delayed sleep phase syndrome. This involves a recurring pattern where falling asleep becomes harder as the night deepens, leading to sleeping very late into the early morning hours and struggling to wake up in the morning. It feels as though the clock is constantly pushed back. If this state persists, it goes beyond mere sleep deprivation and signals danger for our body's metabolism. As blood glucose regulation faces problems, the risk of diabetes rises, and the incidence of cardiovascular disease can also increase. Decreased immunity leads to frequent minor illnesses, and it can also result in mental health challenges such as depression or anxiety. In fact, sleep deprivation leads to brain hypofunction, reducing cognitive function and focus, and causing difficulty in emotional regulation. When our bodies enter a state of being unable to rest when it is time to rest and being unable to function properly when it is time to move, it is only natural for the entire system to break down. Please remember that the beginning of all health, both body and mind, lies in restoring a regular sleep rhythm.
