Heavy meals may increase digestion workload and cause post-meal drowsiness.

High-carbohydrate foods may make some people feel sleepier after eating.

Poor nighttime sleep may increase tiredness after daily meals.

Eating a large meal after fasting may trigger post-meal sleepiness.

Physical or mental fatigue may make drowsiness more noticeable after eating.

Certain health conditions may also contribute to frequent sleepiness after meals.