Final answer:
Tryptophan is the amino acid found in poultry that is associated with inducing sleepiness, as it is a precursor to serotonin and melatonin which help regulate sleep.
Step-by-step explanation:
The amino acid found in poultry that is known to induce sleepiness is Tryptophan. Tryptophan is one of the 20 common amino acids found in proteins. It is an essential amino acid, meaning our body cannot synthesize it and must be obtained through our diet. Tryptophan is a precursor to the neurotransmitter serotonin, which can then be converted to the hormone melatonin, both of which play roles in regulating sleep.