Now you didn't hear this from me, but if you're gonna play early in the morning;
- block the lower crack of your door with loose sheets. It drains a lot of the sound out.
-don't do it every day. You get sloppy when done in quick succession due to lack of sleep and getting to comfortable.
- since your parents know you do this, if you plan on doing it, got take a piss, and listen to their breathing patterns when you go by their rooms. They should be very faint and be at about a five second cycle.
You shouldn't play in the morning, though as it reduces the trust your parents have in you. If you get caught a third time just stop completely.