Sleepyhead

When Henry Nicholls was twenty-one, he was diagnosed with narcolepsy: a medical disorder causing him to fall asleep with no warning. For the healthy but overworked majority, this might sound like an enviable condition, but for Henry, the inability to stay awake is profoundly disabling, especially as it is accompanied by mysterious collapses called cataplexy, poor night-time sleep, hallucinations a...