As already said, tropane plants in small doses are definately sedative and sure have an impact in sleep. With so careful and small amounts smoked, the only hangover one will have will be a somewhat similar to alcohol hangover, albeit 'drier', this in the case alcohol has been drunk along. And yeah they bind well together...
I agree tha LSD is not a recreational substance, yes it can be used recreationally, but so can datura.... at least by some
Shamanita, yes, it could easily be a coincidence you remembered your dream that night. I think coleus or amanita or other more known dream enhancers could have more potential, another [maybe the best] option for a serious lucid dreamer is like GOd said, abstaining from drugs, especially pot or anykind of sedative for a while...