Traditional after-dinner nap; Many people feel that after sleeping, they feel dizzy, weak limbs, and lazy all over. This is because there is a relatively constant index in human blood. When people eat, the blood flow will tilt to the digestive system, which will reduce the blood supply to the brain and limbs. In this way, the brain and limbs can't get enough oxygen and nutrients to support them, and metabolic wastes can't be eliminated in time, which causes a series of discomfort symptoms. As far as physical hygiene is concerned, the rest before lunch is positive and the rest after lunch is negative.