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.
This is probably not significant until after about 16 weeks, however. An interesting study found that women slept as follows: Non-pregnant Pregnant Back 33% 34% Side 60% 65% Stomach 7% 1% before 16 weeks, 0% after 16 weeks This shows that women naturally will stop sleeping on their stomachs as their uterus grows.