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.
Comments about Vicks DayQuil Sinex Daytime Sinus Relief Liquicaps: I get a lot of sinus issues in the early spring and late summer when the weather changes. This can lead to bad headaches and congestion. DayQuill Daytime Sinus Relief is a godsend during these times.