Getting Creative

I've found that on nights when I have a couple pain killers (Vic's, Perk's, etc.) and drinking I'm most creative. When I say creative I mean in the sense that I tend to want to read more, research info on the web, write a blog, review stuff, etc. Instead of just sitting around and staring at the TV. Why is this? Is the brain extremely stimulated and needs to be busy with something? Does the combo stir up thought? If so, might be a good study to find out how it affects your thought process.