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Somnolence
Common Usage
Somnolence is often used to describe temporary sleepiness, especially after eating or during monotonous activities. 
Not Just Tired
Somnolence implies a stronger urge to sleep than just being tired; it's a step closer to actually sleeping. 
Descriptive Imagery
Use somnolence to vividly depict a scene where someone is struggling to stay awake. 