Yup A Lost Soul hit it dead on the nose. The portion of the brain which holds long term memory is called the hippocampus and is stored there for a short period of time before being dumped out into the brains long term memory cortex. The cortex is the most operational protion of the brain during sleep. This is were all of your memories are kept. and its constantly communicating with the Parietal Lobe which controls your senses and the sensory cortex. The Parietal Lobe is by far the most exciting to me because in this portion of the brain displays your awareness and also to me the blind link into Lucidity.