I've found for quite some time that if I drink milk before bed, either a plain glass of milk, coffee or a milo that I get more vivid dreams. But I was under the assumption this was a fairly common scenario, even if we don't know the underlying reason.

Anecdotal: cheese often will make me have vivid dreams and remember them better in the morning. About half the time they will be nightmares but sometimes they will be good. Vivid and entertaining.

To experiment: I think some kinds of cheese (blue) affects me differently than others. Although soft cheese has more lactose than hard. Not sure how long after eating cheese makes a difference. Only noticed it in evening. Need to experiment with lactose free cheese.