After we eat a big meal, the blood supply concentrates around the digestive organs and intestinal system, reducing the blood supply for other activities. We tend to slow down metabolically and in our ambitions. ('Sure, why not have a fourteenth cup of coffee? They won't miss us at the office.;) Equally important, during digestion, foods are broken down into many chemicals, including amino acids such as 1-tryptophan, which help induce sleep. Serotonins, which constrict the blood vessels, also make us drowsy. Alcohol, if consumed with your meal, often produces sleepiness as well.
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