My fiance and I (both mid twenties) live on the first floor of an apartment complex. I rotate between 12 hour day shifts and night shifts three days a week and occasionally have to sleep during the day. My upstairs neighbors work from home/stay at home, have two school aged boys and two large dogs. They are loud all day long during normal working hours, especially playing the piano, vacuuming, and generally banging about. The piano playing starts at noon and continues intermittently through dinner time many days. I'm convinced they play soccer/fetch inside up there when the boys get home from school. We've never had issues with them being loud at night. 

I work Sunday night, and my birthday is Monday. I have plans that evening for which I would like to not be a zombie and actually get to sleep for a reasonable amount of time. Would I be the asshole for asking them to mind their noise levels and not practice the piano on Monday so that I can sleep through the standard work day? I've never officially met them, so this would be the first encounter. To my knowledge, they don't know how inconvenient their daytime routines are to my sleep schedule. I already have blackout curtains, earplugs and an eye mask.

I know that upstairs neighbors are something you sign up for with an apartment complex. Noise regulations don't go into effect until 11 pm on weekdays 12 am on weekends. Officially I don't have a leg to stand on, but is it okay to ask?