Expanding Nielsen's covert REM model, questioning Solms's approach to dreaming and REM sleep, and reinterpreting the Vertes & Eastman view of REM sleep and memory

Nielsen's covert RENT process model explains much of the mentation found in RENT and NREM sleep, but stops short of postulating an interaction of waki ng cognitive processes with the dream mechanisms of RENT sleep. It ranks wi th the Hobson et al. paper as a major theoretical advance. The Solms articl e does not surmount the ever-present problem of defining dreams in a manner conducive to advancing dream theory. Vertes & Eastman review the RENT slee p and learning literature, but make questionable assumptions in doing so.