Circadian Rhythm
The circadian rhythm is the internal clock of the body. It is responsible for controlling the sleep-wake cycle and the motility of the large intestine. Some studies have shown that colonic mobility may decrease during sleep and increase after waking up. This activity would trigger symptoms of IBS in some individuals in the morning. In addition, there is a link between IBS and a disrupted circadian rhythm. Common factors that may affect your circadian rhythm include delayed or advanced sleep phase disorder, irregular sleep-wake rhythm, shift work, or jet lag. [7]
