It's likely you have MAD--Mormon-Acquired Dementia. Unlike other forms of dementia, however, MAD isn't tragic; rather, it's a blessing. As the condition progresses you'll find yourself forgetting all sorts of things: stuff you're supposed to do on Sunday, your temple name, the Lamanites' pigmentation, assorted secret hand signals, the meaning of magic underwear nipple insignia, how to spell "Uchtdorf," how to lie to bishops... it goes on and on.
After jettisoning the above useless information and much more, your brain will suddenly start filling with more wonderful thoughts: cool things to do on Sundays; favorite coffee drinks and craft beers; how to spot spoken and written logical fallacies; the first names of new friends who look, think and make love in ways different from yours; etc.
If we're lucky we'll all be struck down by MAD, hopefully in the prime of life.
I forget it's Sunday all the time. And since I've retired I have a hard time remembering what any day is, because it seldom matters. But you can bet I know when my Social Security check hits the bank.
I heard of a retired guy who said that since he retired, every day is just like the others. The only thing that was significant was that the day the newspaper is big he goes to church.
I spent my Sunday morning at brunch with my wife and her cousin and his wife on the patio of a fine beanery watching all the hot rods drive by on their way to the monster show n' shine in our town.