I noticed tonight that when I had my headlights on, I got home, then rolled up the windows, and when I did all the inner dash lights and my headlights dimmed, and even noticed that my rpm's started to drop as long as I was holding down the window button, any ideas? any help/info would be appreciated

 

I think that is normal. But in any case. Is your battery light on? Are you getting the proper voltage? If not have the battery and the alternator checked. Other than that I wouldnt worry about it. The same thing happens to me when I let my windows up. It only does it when the car is at idle rpm's tho. Hope this helps