E36 Coupe squeaky windows (Pls Help)

Hi guys, i just got my e36 320i coupe a few weeks ago and its great but one anoying problem is the windows which squeak a real lot especially the drivers side . They mostly only seem to do it at night even when there is no dew or rain . i am lost because the seals don`t look worn or anything and the car is in mint condition . Any suggestions will be really appreciated ..

Cheers

ill get that once in a while on my car as well...
i try to take it easy on rolling down the windows too much...

havent tried any course of action for dealing with the problem, but.. i guess if i had to reccomend something, maybe rub some petroleum jelly on the window and roll it down? maybe something needs lubrication down there...