They obviously go to bed early. You could be vindictive and wait until, say, 11pm, then play really loud music that you enjoy. That of course will annoy other neighbours and would be childish. Or you could go over to their house and knock on the door. Proclaim: oh, I love to sing/play guitar and proceed to do so only your own music. when they protest and say you weren't invited you say "oh! I thought the fact that you were waking me up early in the morning meant that everyone was invited like all-night parties."
Of course, during the working hours of the day, there is nothing you can do about it. But in my building you can't play/sing music, do laundry, vaccuum etc. between 10pm and 9am. Most people folow this rule, but some renters recently had an all night party that lasted until 6am as a moving party. Not thrilling, especially for the several seniors that live in my building