Secondary causes of sleepe are divers; as excessive labour, agitation of the body, repletion, as by excesse of meates or drinkes, inanition, as by Copulation and many more of this kinde, which doe so waste the spirits, that of necessity, there behooveth a cessation to be for a time, that new spirits may be recollected for refreshing of it [...]
Source: wiktionary