Hallo,
No tips for the folding except for the ones that are already posted by previous posters on here... but... was thinking if you don't have to wear the dress shirts till the next day, maybe you can hang them up on that bathtub rack thingie (oh what is it called!) and fill the bathtub with hot hot water till it is steamy and then close the door and go to bed. By the next morn, the wrinkles may have straightened themselves out due to steam and gravity.
Maybe worth a try if you are really tired.
Well good luck!
~Little Dragon Kitty