Why do we feel drowsy after eating a large meal ? (01 Sep 2014)
Contrary to myth, it's not caused
by blood being diverted from our brain to our stomach. The drowsyness is
partly because our body activates a " rest and digest" mechanism (the
opposite of "fight or flight" response) and partly because high
carbohydrate meals increase the levels of melatonin in the brain, which
makes us feel sleepy.