Because you obviously don't have to strip beds, dust and vaccum three bedrooms, do ironing for four people, wash all the floors downstairs and cook Sunday lunch!
Until recently, all of my Sundays have been like that! As I return to work this week, I have vowed to change my lifestyle and work less hard. With daughter away at university, that's one less to clean for and I have decided to try and keep at least two Sundays in the month for having a relaxing time with my husband. I am not sure how it will work out but I am going to try very hard.
623, why not find a 'Sunday hobby'? Fishing? Singing in the choir at church? Sunday football? Gardening?
Failing that, why not do some charity work? You might find life less boring in realising there are many around you much worse off than you are?