I've searched for this but didn't get anywhere so...

The driver's side door on my car sags ever so slightly when open and so not only does it not want to close very easily (compared to other 3 doors) but on two occasions when it was really cold out, and the rubber seal gets stiffer, the door came open unexpectedly, just enough for the light to come on. Once while driving and the other when the car was parked so now I have the interior light switched off for fear that the door might come open during the night and drain the battery.
I'm convinced if I could adjust/tighten the hinges it would fix the problem but I don't know how to do it. It looks more complex than I was expecting.
Is there a walkthrough on this or pictures showing what to adjust that anyone knows about? I'd really appreciate it.
It's a 5th gen civic if that helps.