Documentary series taking a behind-the-scenes look at the work of one of the UK's most prestigious sleep clinics, at Papworth Hospital, as night vision cameras give a rare glimpse of the most extraordinary nocturnal human behaviour. Alex is the most energetic sleepwalker in Britain, and has jumped out of windows and run from houses in his sleep. Also, mild–mannered teacher David, whose aggressive night antics are driving his long-suffering wife to exhaustion.