Cataplexy: Rare disorder means mother collapses every time she expresses strong emotion

The mother who cannot laugh or love: Rare disorder means she collapses every time she expresses strong emotion During an attack Kelly can see and hear but her body is temporarily paralysed Attacks can last anything from a few seconds to an hour | UPDATED: 11:18 GMT, 18 April 2012 A woman with a rare condition that means she collapses every time she laughs fears she may have passed the rare illness onto her young son.