A 34-year-old student nurse with a history of autoimmune polyendocrine syndrome type 1 with diabetes mellitus experienced stereotyped ‘bizzing’ sensations (not a noise) in her head with subsequent loss of consciousness. Within six months, four such events occurred. An eye-witnessed account suggested that she reached out to clutch or grab an object, her speech became confused and then she went rigid and blue. She frothed at the mouth with noisy respirations. There was twitching of her hands. The episodes typically lasted 90 seconds. She had bitten her tongue on two occasions but had not been incontinent. She was confused and disorientated for 90 minutes after the episodes. She had sustained at least one head injury as a consequence of the collapses. In two of the events, a blood glucose was recorded as normal. Corrected calcium was low at 1.94 mmol/L. She had some seizures when she was much younger, which were attributed to hypoglycaemia.