I do this now - I have visceral reactions to my daydreams, I spend a lot of time planning them and banking them up for when DH goes out of town and I can have mental time to myself.
I make myself cry, laugh out loud, pace, gesticulate etc. Fortunately I have control over when and where I do this but I find it to be the most important processing mechanism I have - I have found by analysing my daydreams I've been able to get insight into problems in my life and solve them.
I think something that helps is scheduling daydreaming and if the child is still young enough having a chat about the content afterwards (or encourage a diary later).
