How do the dreams trigger btw? I've been pretty much resting at any excuse trying to get more camp events to happen.
You use the illithid options given in dialogues in game (you can use one of 'em when you meet Wyll, then one when you talk about his eye). Mind you, you can use them a limited amount of times. I believe it's 1/per long rest in the beginning, later you can use 2/long rest.