A lot of neighbors don’t realize how far sound carries through thin walls so a friendly ask often works. Catch them early evening or on a weekend and say, “Hey, I’m in 4A - sorry to bother you, I’m up at 6 and the music after 10 has been keeping me up; could you keep weeknights a bit lower but then... i’d appreciate it.” If it slips again, leave a polite note as a reminder and try cheap fixes like earplugs or a fan/white noise, moving your bed off the shared wall, or a draft stopper under the door before involving the landlord.
