238 ANTIENT METAPHYSICS. Book IV. 



* cerning fleeplng and waking.' The difference betwixt the two he 

 makes to be, that, in the one ftate, we have the ufe of our Senfe,% 

 in the other we have not. They both, therefore, belong to the 

 fame part of our Nature, viz. the Animal or Senfitive ; the one being 

 the Adion or Energy of our Senfes, the other the CefTation of that 

 Adion, 



But this alone, as he obferves, is not fufficient to dillinguifli ac- 

 curately the two ftates ; for it often happens, that, when we are a- 

 wake, we have not the adlual ufe or exercife of any Senfe. We 

 muft therefore add to the definition of fleeping, that not only we 

 have not the ufe of our Senfes in that flate, but that we have not the 

 capacity of ufing them, during our continuance in that flate ; fo 

 that, while we are afleep, though objeds of Senfe be prefented to 

 us, and ad upon the organs of Senfe, as when we are awake, we 

 do not perceive them. And from Hence Ariflotle infers, that if, in 

 in our fleep, we fee any light, or hear any noife, as fome people do, 

 w^e are not perfedly afleep ; nor are fuch appearances in the Mind 

 Phantafms or Dreams, but real Senfations *. 



It appears, therefore, as Ariftctle has obferved, that Sleeping does 

 not belong to any one Senfe, or to all confidered feverally, but to 

 the common Senforium, by which we fee, hear, fmell, tafle, and 

 touch, and diflinguifh one of thefe Senfations from another, and per- 

 ceive the difference betwixt Senfations of the fame kind. This is 

 what Ariftotle calls, ' the Common Scyijc -^ and that part of the Mind 

 to which it belongs, ' the Comynon Scnjor'ium f. And, as this Senfe 

 belongs to all animals, though they may want fome of the particu- 

 lar Senfes, and even all of them except touch, fleeping, there- 

 fore, belongs to the whole Animal Nature j and there is no Animal 

 that does not fleep. 



Sleep, 



• Lib. de Infomniis, cap. ultimum. 

 t Lib. de Somno et Vigilia, cap. 2. 



