Diet3 mentions

Avoid Very Large Meals

This practice is to avoid very large meals, especially when you need to stay sharp during the day. Big meals can shift the body toward digestion, pulling blood and resources toward the gut and away from the brain, which often makes you sleepy and less focused afterward.

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“All that said, if you eat a very large meal, it doesn't matter if you slept terrifically well 10 hours the night before, or if you are about to go to sleep, or if it's the middle of the afternoon, if your gut is full of food, there's just a large volume of food in your gut, it's going to divert a lot of blood and other critical resources away from other organs of your body, in particular your brain, and you're going to be sleepy after eating a big meal.”

huberman · Essentials: Sleep Toolkit for Optimizing Sleep & Sleep-Wake Timing · Jun 11, 2026 · 13:30 · open ↗

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