Do you believe in the holiday food coma?Many people do.A mainstay on the dinner table at this time of year, turkey contains tryptophan, which is widely believed to be responsible for the uncontrollable yawns and sudden snoozes common after huge family feasts.8 reasons why you wake up tired, and how to fix it Tryptophan is an essential amino acid needed to make serotonin, a hormone that has many functions in our body, including balancing mood and sleep, said sleep specialist Dr. Raj Dasgupta, an associate professor of clinical medicine at the University of Southern California's Keck School of Medicine.
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