I've just started using my Resmed bipap machine (14/12 setting) with an Activa mask and a humidifier. I've used it for two nights and even though I've slept fairly well (I'm still getting used to this and learning not to yank off the mask at night), I've woken up both mornings with a headache. Any idea what could be causing this? I have slight nasal congestion from a cold - could that be related?

