Rivastigmine (sold under the trade name Exelon) is a parasympathomimetic or cholinergic agent for the treatment of mild to moderate dementia of the Alzheimer's type and dementia due to Parkinson's disease.
Quick Answer. According to the University of Washington, cows sleep for approximately 3.9 hours per day, meaning that they spend about 16.9 percent of the day sleeping. Adult humans sleep for approximately 8 hours per day, which represents 33.3 percent of the day. Human infants sleep approximately 16 hours per day.
More often, they sleep fully standingâagain, in short burstsâor experience a sort of half-sleeping resting period, in which the eyes remain half-open, the animal stays fully upright, and the ears continue to twitch. All in all, adult giraffes get by on just 30 minutes of sleep a night (on average).