Causes of Daytime Sleepiness

1. Medications (sedatives, tranquilizers, anticonvulsants,antihistaminics, anti depressants, Beta blockers,dopamine agonists, L-dopa, alcohol abuse)

2. Acute medical illness of mononucleosis type, including mundane respiratory and gastrointestinal infections

3. Post-surgical, post-concussive and post-anesthetic states

4. Chronic neurologic diseases- MS, Dementias

5. Depression

6. Metabolic derangements - hypothyroidism, Addison`s disease, severe diabetes

7. Encephalitic disease - Post Viral encephalitis, Trypanosomiasis, Encephalitis lethargica (historical)

8. Lesions of hypothalamus - Kleine - Levin syndrome, Hypothalamic tumor or granuloma

9. Sleep apnea syndrome : Central and Obstructive

10. Narcolepsy - cataplexy

11. Idiopathic hypersomnia

(From : Adams and Victor)