Can cats have cataplexy if so what do they do when they have it cheers?

Yes, cataplexy can be present in cats, as sited below.

http://www.answers.com/library/Veterinary%20Dictionary-cid-13513 cataplexy Top http://www.answers.com/ > http://www.answers.com/main/what_content.jsp > http://www.answers.com/main/zoology.jsp > http://www.answers.com/library/Veterinary+Dictionary-cid-13513 A condition, often associated with http://www.answers.com/topic/narcolepsy; marked by abrupt attacks of a loss of voluntary muscular function (flaccid paralysis), except those controlling respiration and eye movement. Observed in dogs, cats and horses, especially Shetland ponies. In dogs these have been precipitated by extreme excitement, vigorous physical or sexual activity. Usually of short duration. Most cases are idiopathic, but can be associated with lesions of the brainstem.

* food-elicited c. test - cataleptic dogs demonstrate repeated attacks of catalepsy when presented with several individual pieces of food. Source: http://www.answers.com/topic/cataplexy