This is a typical complaint from people new to BiPAP therapy. It often occurs because wakeful breathing differs from sleep breathing. Wakeful breathing is more irregular, especially because you may anticipate what the machine will do and try to match that as you're trying to fall asleep.
Once you fall asleep, the machine should synchronize with your breathing. Some new BiPAP users find that relaxation breathing exercises help, and many individuals report that they grow accustomed to using the machine within a few weeks.
That said, BiPAP machines are complex devices and may have specific prescribed therapy modes and optional comfort settings. If you're still having trouble acclimating to BiPAP therapy after an initial break-in period, contact our clinical sleep therapy specialists at 844-757-9355 to discuss the specifics of your device and prescribed therapy settings.