No matter what time of the day it is listening to music at a volume that disturbs your neighbors is a misdemor in many towns. One of the many things to consider when choosing an apartment is how thick the walls are. So you can enjoy your music and your neighbor can enjoy their peace.
Secondly, most apartments have rules that say loud music and disturbances are a no-no after a certain time of the day. Check your apartment's "handbook/rulebook/whatever" to see what it says, or just call the management and leave a complaint.
OR... you could do it the manly way and just go downstairs and ask them to turn it down after 8 or so. If they refuse, then you give them problems. Fair warning is warning enough.