It's a very good sign that you're already experiencing improvement. Keep noticing how things improve, any problems using the equipment, and be sure to have follow-up appointments.
As the others said, it quite varies how people improve. But you're lucky, you're already noticing improvement. I like trebons' description of one day, you just realize it. Some people won't notice any improvements, then all of a sudden they feel it. Everyone is different. The important thing is to monitor how're doing and if the equipment is working successfully for you (comfortable mask, few leaks, able to sleep longer hours with it, etc.) And yeah, sleep apnea can run in families, because many of us inherit the throat structure. Thanks folks! :) I'm sure my mother had it, and my brother has it. And one of our moderators, Okie, well, she has so many relatives with sleep apnea and using cpap, that if they all book a hotel, the electricity goes dim. teehee.