OF SLEEP. 201 



324. We awake refreshed with sleep ; and this return 

 to life is attended by the same phenomena as the 

 approach of sleep, — by gaping, to which is generally 

 associated stretching, by some degree of dulness of 

 the senses, &c. 



325. The causes of waking correspond with those of 

 going to sleep. 



The proximate is the more free return of blood to 

 the head. 



The remote are (besides the power of custom, which 

 is in this respect very great) various stimuli applied to 

 the external or internal senses, either immediately affect- 

 ing the nervous system, as the distention of the bladder, 

 or mediately, by the intervention of the imagination, as 

 in dreaming. 



326. Dreams are a sporting, as it were, of the imagi- 

 nation, in which it recalls the ideas of objects formerly 

 perceived, especially of objects of sight, and appears 

 to employ and interest itself with them. 



It has been disputed whether dreams are natural dur- 

 ing health. Some believe that they always occur during 

 sleep, although they may escape our memory.* Others 

 conceive them the consequence only of derangement in 

 some of the abdominal viscera .f Very healthy adults 

 have asserted that they never dreamt.^ 



They are generally confused and irregular, but occa- 

 sionally discover extraordinary marks of reason. § 



* Consult Kant, Critik der Urtheihkra/t. p. 298. and Anthropologic, p. 80. 



\ v. F. Xav. Mezler, von der Schwarzgallichtcn Conxtituticn. p. 80. 



X v. Locke, Essay concerning Human Understanding. Vol. i. p. 74. Lond. 

 1726. 8vo. 



§ See for instance what Hollmann has related of himself in this particular. 

 Pncumatolog. Psyckolog. ft Thcttl. Natural. Gotting. 1720. 8vO. p. 196, 



