ι De Somniis α Causa per Accidens from the Book of Wisdom or Folly in The Libri of Aleister Crowley

“This exciting Cause is commonly of two kinds: videlicet, imprimis, the physical Condition of the Sleeper, as a Dream of Water caused by a shower without, or a Dream of Strangulation caused by a Dyspæa, or a Dream of Lust caused by the seminal Congestions of an unclean Life, or a Dream of falling or flying caused by some unstable Equilibrium of Body.” [via]