Nauru [wiki] is the world's smallest island nation, the smallest independent republic, and the only republic in the world without an official capital. Nauru only has one significant source of income: phosphates from thousands of years' worth of guano or bird droppings.
We may have the same friends. The same ones who take NyQuil when they're not really sick, just to help them sleep. So they're taking it for the diphenhydramine (Benadryl), which is much more cheaply purchased alone and as a generic. DayQuil is dextromethorphan, acetaminophen, and phenylephrine.
Expected to not cause drowsiness, Day Quil is said to be ideal to be taken even during daytime or work hours. The most recent version of DayQuil has claimed to have removed pseudoephedrine and instead uses phenylephrine in order to avoid any problems with the restrictions over the former.