Info in the British Listed Buildings - English Heritage Building ID: 235924
A stone, (Watson's Wake) is to be found on the tower and is dedicated to Cuthbert Watson, a local personality who died in 1669 and the stone commemorates the fatal fall from the tower of the local somnambulist.
Medical Definition of somnambulism. - an abnormal condition of sleep in which motor acts (as walking) are performed.
Common definition = sleepwalking.