rising of the lights

Etymology
From.

Noun

 * 1)  An illness or obstructive condition of the larynx, trachea, or lungs, found as a cause of death on bills of mortality in the 16- and 1700s; possibly croup.
 * 2) * c. 1660-1674,, quoted in 2008, David Brandon, Alan Brooke, London: City of the Dead, The History Press (ISBN 9780752496177):
 * John Graunt reflected on the increases in death from particular diseases between 1634 and 1660: That the Rising of the lights (supposed in  most Cases to be the Fits of the Mother) have also encreased in thirty years,