Isn’t NyQuil supposed to make you sleepy?

So why am I sitting here, bright eyed and bushy tailed, and feeling rather agitated, I might add, two hours after medicating my flu with the trusty green stuff?

It must be that daggum store brand my husband insisted on buying.  "It’s the exact same ingredients," he said.  No.  It is NOT the same.  I’m here to tell you. 

I want my NyQuil. 

Is there a rule against mixing NyQuil and Unisom?