Question

Why a person sleep after eating food

Answer 1

Overeating can also cause sleepiness. Post-meal, the body streams more blood to the digestive system to better digestfoods in massive amounts. This causes a temporary blood and nutrients shortage in the brain. ...Eating smaller meals but more frequently can also help preserve energy so you don't feel drowsy post-meal....

Answer 2

After a heavy meal our insulin level spike.  This is because for every heavy meal we eat out pancreas produce insulin for regulating blood sugar levels. The heavier the meal the more insulin will be produced. With the increased secretion of insulin our body produces sleep hormone which metabolizes into serotonin and melatonin in our brain which produced drowsiness. This nerve response tells our body that we should rest now.