Sleep is essential to health and just plain awesome. It regulates hormone cycles, recovers the muscles, and promotes rejuvenating and balancing effects on the digestive system, immune system, and nervous systems. Chances are you are not getting enough of it. This could be caused by many things, but one of the most overlooked factors affecting your quality and quantity of sleep is light.
Our bodies have evolved to tune into the rhythms of day and night. This biological rhythm, or internal clock, is called the circadian rhythm. It tells your body when to be awake and when to sleep. The primary control of the circadian system comes from an external source — light. We wake up to bright sunlight, are awake during daylight hours, calm down at dusk as light levels decrease and rest during darkness. You may have noticed how your mood can vary greatly from sunny to overcast days. During fall/winter months, people often complain of seasonal affectedness, with symptoms similar to depression, due to the short duration of daylight. This is due to the diminished amount of light received at the eye during these times and can have negative effects on a person’s health.