All the studies and researches I have come across suggest that states of awareness depends with the day’s occurrences and lifelong experiences and sleep is the key when it comes to the level of alertness. Significant aspects in every day consciousness are a result of biological occurrences and more precisely, the circadian rhythms brought about by the suprachiasmatic nucleus. Essentially our external environment corresponds with our biological clocks, and light typically becomes an important element the timing of the events. When I cross borders into many different time zones or work rotating shifts, I tend to feel disruptions in my circadian cycles that at times leads to insomnia, decreased alertness and sleepiness. If I continue extending the amount of time I go without sleep, I usually cause a sleep debt and consequently experience many physiological and psychological consequences.
Changes in the function and structure of an individual’s brain at the time of development can have significant and gradual implications on the patterns of sleep. The kind of sleep we undertake entirely reduces and becomes is gradually fragmented as life unfolds. Many medical conditions and stress are also issues that cause interferences in sleep. The kind of food we take, the medications we use and the environment in which we sleep are external factors which affects the quality and duration of our sleep. These factors limit our depth of sleep and increases number of awakenings.
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In my opinion, light is the most important external factor that has a significant implication on sleep. It affects both in a direct way by raising the likelihood of insomnia, and indirectly by affecting peoples internal clock timing and therefore influencing their sleeping time. It does so through affecting people’s internalized timing system through the special light sensitive cells in the retina of their eyes.
