Fish
Fish are rich in tryptophan, a natural sedative, with shrimp, cod, tuna and halibut having the highest levels, even more than turkey. But since not all seafood choices are healthy (some are high in contaminants) or for the planet (many are overfished, or methods for catching them kill other species), stick to catches like Pacific cod from Alaska or pole-caught Albacore tuna from the U.S. or British Columbia.
Too Much for a Bedtime Snack?
Grilled Jalapeño Tuna Bruschetta