I would like to open a discussion about the use of nervous system depressants and drugs causing drowsiness.

Examples including Dimenhydrinate (gravol and anti-nausiant), Diphenhydramine (alergy medicines), DXM (cough syrup), and Cyclobenzaprine (muscle relaxant), etc....

1) I would like to know if this will enhance my chance of remembering my dreams?
2) Will it increase the chance of a lucid dream?
3) Are hallucinations considered dreams?
4) What in fact is a hallucinations. Like do you keep dozing off and dreaming OR do you see things realtime during your daily experiences.

I realize this could be quite controversial and is a lot to answer, but everyones help would be nice.