Yes, yes, and yes.
Amount of sleep can affect dream duration, recall, and lucidity. Usually when a person starves themselves of sleep dream recall will go down, so will overall dreaming ability.
Movies and other visual/audio perceptions affect what you dream a great deal. This is how dream therapy works. Similarly, watching something like the X-files right before you go to sleep is a fresh imprint on your mind that the subconcious can draw on when you are asleep. Dreams are just a remixed experience of your day, albeit many times distorted.
Eating definitely affects dreaming. Nutrients affect proteins/hormones that control you mind, directly affecting dreams. Test out different things for different results.
(And I don't know about caffenine. It doesn't affect me for some reason.)
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