Waking percepts endure for a long time, but dream objects are also observed to endure for months and years. The money a dreamer possesses cannot purchase his bread and butter when he feels hungry in the waking state,. But we can say that the money owned by a waking person does not serve a similar purpose in his dreams. Dream experiences are found to be fantastic illogical random arbitrary; whereas waking world seems to be pretty logical things work according to the laws of science - so even practicality will not work.