The “tryptophan makes you sleepy” thing is a myth. It’s just an amino acid. See here: http://en.wikipedia.org/wiki/Tryptophan#Turkey_meat_and_drowsiness
Parker and Hart
Mastroianni and Hart
The “tryptophan makes you sleepy” thing is a myth. It’s just an amino acid. See here: http://en.wikipedia.org/wiki/Tryptophan#Turkey_meat_and_drowsiness