Heavy lids
Scratchy eyes
Blurred vision
Heavy head, as if it's wobbling on the neck
Eyes drifting shut involuntarily
Bloodshot eyes, red-rimmed
Bags or circles under eyes
Heaviness in limbs
Inability to focus
Ringing in ears/sounds coming as if from very far away
Swaying from side to side
Sagging in chair
Hands hanging limply
Unkempt appearance
Lack of appetite
Lack of interest in hobbies/activities
Poor performance at school/work
Poor communication (repeating things, incoherence, thoughts trailing off)
Disorganization
Forgetfulness
Falling asleep in odd places, at odd times
Sleeping a lot/not sleeping enough
A subdued voice
Depression
Men: unshaven
Muttering, mumbling
Slouching, leaning, shoulders bowing over chest
Yawning
Eyes tearing up
Rumpled clothing
Wanting/needing to sit or lie down
Attempting to stay wakeful through coffee, stimulants, energy drinks, loud music, TV, pacing etc
Clumsiness, fumbling
A distant look or glaze in the eyes
Supporting head with a hand
Laying head on arms
Tipping head back and closing eyes briefly
Rubbing at face and eyes
Slowed breathing and heartbeat
Heavy muscles, bone-weariness
Impatience
Slowed reaction time
Inattention
Jolting at sudden sounds (phone ringing, door slamming, etc)