I hate deadlines just before Xmas....

Why do contractors put deadlines just before the Xmas break? Is it really fruitful having people trying to make decisions just before they fly off/go shopping/paralytically drunk.....? It's 9.30pm on a Thursday night, I've been out the past 3 nights - needed to get home tonight to tidy and do laundry and there I was trying to learn photoshop at 5.30pm..........my brain is about to explode and can't wait for the architect's comments tomorrow when he finds out my very late drawing is even later......bring on xmas....sob :(