I envy Christian. I wouldn't turn down an opportunity to get more hours in if the chance arises, even if it's on my only day off I have in the week, because I do need the money. Would I rather sleep in? Sure, because I do work 6 days a week. But given the opportunity, I would take that person's hours.
Not only do I get more money in my wallet, but I also get some brownie points with the higher ups, meaning that if there needs to be a staff cut, I won't be someone that will get the boot because I'm willing to work, even on my day off [s]excluding the fact that I can work pretty much any position but managerial in my store[/s]. That extra layer of job security to me sounds a lot better than a day off to sleep in.