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Feeling sleepy after meals is a common symptom of insulin resistance, a risk factor for diabetes. Insulin resistance is common today and is a stepping-stone to diabetes. Overeating and eating a diet high in sugar and starchy foods causes insulin resistance. These foods include breads, rice, pasta, pastries, chips, potatoes, soda, sweet coffee drinks, and more.
1 Snooze Foods and Pick-Me-Ups Certain foods contain an amino acid called tryptophan that causes sleepiness. 2  Carbohydrates make tryptophan more available to the brain, which is why carbohydrate-heavy meals can make you drowsy. It is made in the brain by converting tryptophan first to serotonin and then to melatonin, which is secreted at night by the pineal gland in the brain to induce and maintain sleep. 2  Scientific evidence shows little or no benefit of melatonin in improving sleep.