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 1 1|         waking is the contrary of sleeping, and one of these two must
 2 1|          follow that the state of sleeping is necessary. Finally, if
 3 1|           must also be capable of sleeping, since it is impossible
 4 1|         animal to continue always sleeping. For sleep is an affection
 5 1|         have eyes, have been seen sleeping. "Hard-eyed" creatures and
 6 1| sense-perception there is neither sleeping nor waking. But creatures
 7 2|           evident that waking and sleeping are an affection of this [
 8 2|          to all [animals].~For if sleeping were caused by the special
 9 2|        the affection of waking or sleeping arises in animals. Now,
10 2|     conclude] accordingly that if sleeping and waking are affections
11 3|           affection of waking and sleeping originates, and whence do
12 3|        that they are not cases of sleeping or dreaming].~As we observed
13 3|       while the things that cause sleeping are themselves hot. Is the
14 3|           now stated the cause of sleeping, viz. that it consists in