I've never heard about the dream thing, but rather just that it isnt a good idea to eat before sleeping. The reason being is that it is alot of work to digest things, which means your body cant fully "shut down" and rest correctly. This follows with what grimm said, if you eat alot before-hand you will go to sleep faster, but that is because the blood flow to your digestive organs is increased and the rest of the body slows and recives less energy.