EEG evidence does not show sleeplike patterns for hypnotized persons. Hypnosis causes a person to be more suggestible than they would be normally. Hypnosis may be related to a dissociation between conscious and unconscious processing. Text discusses experiments that suggest something like this may be occurring in hypnotic states. Hypnosis causes a person to be more suggestible than they would be normally.
Hypnosis can promote accurate memory and raise to consciousness long forgotten information.
The text raises serious doubts about such claims. The evidence for such effects is controversial and anecdotal. This is particularly dubious for claims to restore memories from childhood before the age of 5 or 6.