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.
Yes, Dayquil is fine, Nyquil is not. I was told this during my last pregnancy last year and did take Dayquil as I was very ill during the 1st trimester and even into the 2nd trimester. Dr approved it..and my baby was fine..he is now 20 months old.