Diphenhydramine makes me jittery.
So you are welcome to my share of Nyquil and all similar products.
I'm kind of jealous that it works so well for so many people!
It (or something in Nyquil) makes me extremely sick to my stomach.

I wish it didn't people who like it seem to really like it.
We travel the states usually once a year. I have been sick with a bad cough for a few days now. I found in my cupboard a bottle of Nyquil!!!!
Oh yes how I love that stuff (well, to get rid of coughs anyway) I was able to get a great night sleep last night...
I so wish I could buy something like that over here in Australia.....
It has been my saviour!
That gave me a smile. Do you know Nyquil's motto, or ad tag line, or whatever you call it? "The nighttime, sniffling, sneezing, coughing, aching, best-sleep-you-ever-got-with-a-cold medicine." You almost sound like one of their ads