David Days was performing at Portland’s Royal Manor Theatre on Friday when he tripped over a participant’s leg.
His team could not rouse him and the audience was asked to leave while the people were still “asleep” on stage.
They were “woken up” soon after when Mr Days recovered. His manager said the performer has a voice recording which can be used to bring people round.
The hypnotist later wrote on his Facebook page: “I would just like to let my fans know that I am completely fine.
“A little bruised, but that’s all. Thanks for your support tonight, it was a great show with some great volunteers.”
However, Alan Coman, treasurer of the Royal Manor Theatre, has disputed Mr Days’ claims that he passed out and said the episode was “only a joke”.
“It was part of a project for students who were filming the whole thing… but they (the people on stage being hypnotised) weren’t pretending because they didn’t get up to help.
“The audience didn’t know (that it was part of the act) but it was purely to test hypnotism,” he said.
But Mr Days’ manager, Tara Nix, insisted it was not part of the show.
‘Loads of commotion’
She said: “He was out for a little while and that is why we asked the audience to leave.
“Three people were left on stage but we always have a back-up tape and a back-up hypnotist to step in if needed.
“Luckily, it wasn’t too long until he recovered and he and the guests are fine.
“To be honest I think this is the first time it has ever happened to a hypnotist.”
Audience member Fiona Faye said: “He was pulled from stage and there was loads of commotion from a number of people backstage including one man who ran to the other side of the stage to get a first aid kit.
“At first the audience, including us, found it very funny and thought it was part of the act, but as time went on we began to realise that it was not part of the show and he had actually hurt himself.
“At this point we become very worried not only for David Days but also the guests that were onstage oblivious to anything as they were still hypnotised.
“They simply just sat there ‘asleep’.”