Premanand Maharaj Ji
Why does food make me lazy and sleepy, and how should I eat?
Tamo guna brings sleep and laziness; fix your food
Sleep, laziness and negligence (pramad) arise from tamo guna, the quality of dullness. Avoiding tamasic food increases sattva guna, and sattvic food in small quantity is what to eat.
Sleep, laziness and negligence arise from tamo guna alone. That is what troubles us. So take sattvic food, and take it in small quantity.