“…6 It can be associated with impaired alertness, impacting on quality of life and impairing performance with inevitable consequences for safety. 7,8 Although a number of potential causes exist for sleepiness, including most commonly, obstructive sleep apnoea hypopnoea syndrome (OSAHS), these are usually evident with an associated history of snoring or witnessed breathing pauses and are commonly referred to respiratory sleep units. When the diagnosis is less clear, referral to neurology may be made to consider non-respiratory causes.…”