I have a brother who is 53 years old. For the past years after eating a meal he will sit on the couch and immediately fall asleep. The house can be full of people talking and laughing and he still falls asleep. He is healthy and have not had any major health issues other than kidney stones. He works a full time job and doesn t have a problem while driving but will fall asleep if a passenger in the car. Should him falling asleep concern us?