why does protein shakes make me tired?

Does Protein Powder Work? (Spoiler: YES, but there’s a catch)

Drinking a protein shake before bed promotes sleep by pushing the amino-acid tryptophan into your system. Tryptophan enhances the production of the happy hormone serotonin and the sleep-inducing hormone melatonin.

Why You Get Sleepy After Eating Protein? – Dr.Berg

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