Because of Tryptophan? Maybe it’s a huge meal with a lot of carbs.
What is Tryptophan?
It’s an essential Amino Acid (Amino Acids are the building blocks of protein biosynthesis)
Tryptophan also raises Serotonin levels in the brain. Serotonin does regulate a persons mood. It helps with memory and learning. Serotonin also converts into Melatonin, which can help with a deep sleep.
It has been used to treat depression. Sounds better than the advice from the guy who told me that if I was depressed I should squirt hot butter up my ass ( https://evolvemylife.com/2012/10/01/not-the-right-diet-for-me-but-a-great-story/ ).
You can find Tryptophan in other foods including: Chicken, Tuna, Salmon, Shrimp, Halibut, Sesame Seeds, Sunflower Seeds, Asparagus, Eggs.