SECT. XVIII. i . OF SLEEP. 153 



SECT. XVIII. 



OF SLEEP. 



I. Volition is Ju/pend*d in fleep. 2- Sen/at ion continues. Dreams 

 prevent delirium and inflammation. 3. Nightmare. 4. Ceafe- 



. lefs flow of ideas in dreams. 5 We fee m to receive them by the 

 fenfes. Optic nerve perfectly fenfible in fleep. Eye* lefs dazzled 

 after dreaming of vifible objects. 6 Reverie, belief. 7. How 

 we diftinguifh ideas from perceptions. 8 Variety of fcenery in 

 dreams, excellence of the fen fe of vijiin. 9 Novelty of combina- 

 tion in dreams. \ o Diftinclne/s of imagery in dreams. 1 1 . Ra- 

 pidity of tranfaclion in dreams. 1 2. Of meafuring time. Of 

 dramatic time and place. Why a dull play induces Jleep ^ and an 

 inter efting one reverie. 13. Confcioufnefs of our exigence and 

 identity in dreams. 14. How we awake fometimes fuddenly 9 

 fometimes frequently. 15. Irritative motions continue in Jleep 9 

 internal irritations are fucceeded by fenfition. Senftbility increafes 

 during Jleep t and irritability. Morning dreams. Why epilepfies 

 occur injleep. Ecjlacy of children. Cafe of convulfions in Jleep. 

 Cramp) why painful. Aftkma. Morning fiveats. Increafe of 

 heat. Increafe of urine injleep. Why more liable to take cold in 

 fleep. Catarrh from thin night -caps. Why <we feel chilly at the 

 approach of Jleep> and at waking in the often air. 1 6. Why the 

 gout commences in fleep. Secretions are more copious injleep) young 

 animals and plants grow more in fleep. 17. Inconjtftency of 

 dreams. Abfence of furprife in dreams. 18. Why we forget 

 fome dreams and not others. 19. Sleep talkers awake with fur- 

 prife. 2o.' Remote caufes of Jleep. Atmofphere with lefs oxygene. 

 CompreJ/ion of the brain in the fpina bifda. By whirling on a 

 horizontal wheel. By cold. 21. Definition of Jleep. 



i. THERE are four fituations of our fyftem, which in their 

 moderate degrees are not ufually termed difeafes, and yet 

 abound with many very curious and inftrudlive phenomena ; 

 thefe are fleep, reverie, vertigo, drunkenneis. Thefe we fhall 

 previoufly confider, before we ftep forwards to develop the caufes 

 and cures of difeafes with the modes of the operation of medi- 

 cines. 



As all thofe trains and tribes of animal motion, which are 

 fubjecl: to volition, were the laft that were caufed, their con- 

 nexion is weaker than that of the other claffes ; and there is 

 a peculiar circumftance attending this caufation, which is, that 

 :t is entirely fufpended during fleep ; whilft the other clafles of 



VOL, I. W motion, 



