When we’re not eating or sleeping, we’re supposed to be engaged in some form of physical activity. In fact, our metabolism and physiology evolved so that our body can perform physical activity throughout our wakeful hours from morning to evening. When we are active we are supposed to use most of our muscles, which together constitute nearly 50% of our body weight. Many of our muscle groups are under autonomic control and work without us even knowing it. These include the cardiac muscles of the heart and the smooth muscles of our digestive tract. Yet even these muscles have a circadian rhythm; they are more efficient during the day than at night.
Our gut muscles automatically stretch and flex to produce what we call gut mobility. This is what moves digested food from the stomach through the intestines. Gut mobility increases during the daytime and is very slow at night. Because gut mobility is less active at night, when we eat late, the food moves slowly down the tract and we can develop indigestion.

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