no
yes
yes
The causes of excessive daytime sleepiness include lacking sleep during the night and also some illnesses or their treatment. If someone is having chemotherapy this can cause sleepiness. Also if someone is not eating enough and they are starving this can cause sleepiness.
Ethanol- Depressant (Alcohol)
Could be narcolepsy.
The short answer is, it increases melatonin production which causes sleepiness.
Nuvigil or Armodafinil is used to treat excessive sleepiness. It's a controlled substance with possible abuse potential, but it causes wakefulness, not sleepiness as narcotics do.
Tryptophan
Long-term or chronic insomnia lasts more than three weeks and increases the risk for injuries during daytime activities because of sleepiness. Chronic insomnia can also lead to mood disorders like depression.
migrains or arthuritous
Yes, Chronic sinus can cause sleppiness at mid after noon. Especially If you have Sphenoid sinus infection, then you will get sleepiness at afternoon and tiredness.