Prozac, Paxil, and Zoloft are all Selective Serotonin Reuptake Inhibitors (SSRIs). They treat depression by increasing the levels of serotonin in the brain. Serotonin is a neurotransmitter that carries signal between brain cells, and these SSRIs block the reabsorption of serotonin so it is more available to the body.
This amino acid is used by the body to produce serotonin, which is responsible for drowsiness. Moreover, foods containing carbohydrates also help produce serotonin and tryptophan amino acids found in the brain. This is the reason why you feel sleepy after eating carbohydrate-rich foods.
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