De somno et vigilia theses ad disputandum propositae

LX.

However, sleep that is too long or too short is harmful, for the reason that both weaken the body: the latter indeed by neither digesting nor increasing, but by dissolving humors due to vigils; the former, however, by consuming the internal humor more vehemently.

LXI.

Furthermore, long and morning sleep, which we take after digestion has been legitimately completed, usually brings about sloth, torpor, and a certain weariness: either because it allows excrementitious vapors, previously separated, to slip back into the depths and mix with the spirits, which cause the aforementioned discomforts until they are resolved by motion or by sleep being protracted further, and the spirits are purified anew; or because useless humor is retained at the mouth of the stomach, creating or increasing such trouble. And there is almost no other reason regarding the midday sleep admitted beyond custom.

LXII.

What we said about short sleep is to be judged the same for turbulent and light sleep: because it does not allow the heat to remain in the workshop of digestion, as is fitting.

LXIII.

As for bodies, both sleep and waking are conducive to those correctly affected; for those badly affected, one is always, rarely both, harmful. For example: if the internal viscera are vexed by fluxes of humors, as in the vigor of fevers, suffocation of the womb, fainting, and similar cases, with heat driven to the internal viscera, sleep is harmful, and waking is useful.

LXIIII.

Conversely, if blood erupts to external parts, or the body is being digested by excessive sweat, or other evacuation, likewise