Nielsen's model presents a new isomorphic brain-mind view-point, according
to which the sole dream generator is found in a REM-on (explicit or covert
RENT) mechanism. Such a model cannot explain the dreamlike activity during
SWS (slow wave sleep). SO (sleep onset) and in the last period of sleep. Mo
reover the hypothesis contrasts with Solms's data, which show that dreaming
is present also in case of destruction of the RENT generator.