MODEL RELEASED. Sleep apnoea research. Young woman attached to electrodes to measure her brain, heart and face and neck muscle activity as she sleeps. Sleep apnoea is a disorder in which breathing is interrupted during sleep. Breathing usually resumes within a couple of seconds, although it may take as long as a minute. Overweight men are most at risk of sleep apnoea, although it can affect anyone. Treatment is with a controlled stream of air pumped through a face mask. Photographed at the Sleep Research Unit, American Hospital of Paris, France.