I can't remember where I read this but excessive daydreaming is an aspie trait. Hyper sensory, lack of social stimulation and the need to internally stim are all contributing factors to excessive daydreaming. the hyper sensory issue would be like creating an imaginary opera house performance where you have control over the volume if the singers get too loud. On the social end. One would need a world to place their imaginary friends in to be with since reality friends(if any?) may not give ample stimulation. The daydream world may also be a place of stim simulation for aspies who need to stim but are in a public place or are around other people and stimming out loud would be inappropriate or embarrassing.