Who doesn't love the post-Thanksgiving nap? After all, turkey contains tryptophan — an amino acid that is a component of some of the brain chemicals that help you relax.

But plenty of foods contain tryptophan. Cheddar cheese has even more than turkey, yet cheddar is never pointed out as a sleep inducing food.

Experts say that instead, the carbs, alcohol, and general size of the turkey-day feast are the cause of those delicious holiday siestas.