The Real Reason You Feel Sleepy After Eating.
Ever feel sleepy after a meal? That’s called postprandial somnolence, and it’s pretty common. It can happen for a few reasons, like eating certain foods, large portions, or even meal timing. Here’s why you might feel tired after eating—and what you can do about it.

References:
https://www.medicalnewstoday.com/articles/323379