Sleepiness (Narcolepsy)

Cimex

Irresistible sleepiness.

Cyclamen.

Sleepiness, rhoroseness, lassitude, stupor, disinclination to work, great dejection and melancholy.

Indol

Sleepiness with lassitude. Wants to lie  down  all the time. No desire to work.

Natrum Sulph

While reading.

Phosphorus

After anger or after laughing.  From weakness.

Pulsatilla

While eating.

Arinca M.

and

Baptisia

When answering. (This state generally occurs in typhoid, intermittent fevers, influenza etc.)

Magnesia Carb

After eating. While standing.

Sulphur

After stool. Acthusa. After stool or after vomiting.

Hyoscyamus

After mental exertion.

Naja

Sleep profound like a log with stertorous breathing, a typical reptilian state.

Natrum Mur

Sleepiness and drowsiness after meals

Causticum

Intense sleepiness during the day, can scarcely resist it, must lie down.

Chelidonium

Drowsiness which is so marked even in the open air, that she is near falling asleep while walking.

Kali Brom

Drops asleep in chair.