Eye catalepsy, it sounds a little frightening like some kind of ocular spasm, but it is actually one of the most effective ways to relax. Hypnotherapists use the eye catalepsy technique both to test trance level and to induce it. If a hypnotist asks you to close their eyes so tight that you couldn't open them if you wanted to, that is a set up to eye catalepsy. When you try to open your eyes, the hypnotic suggestion works to keep them shut and the eyelids tremble slightly, simulating REM sleep. That tremble is a sign of hypnotic eye catalepsy.