Last night - CPAP didn't feel right

[jamwin]

Not sure how to describe this: I have finally got used to using the CPAP, but last night when I put it on in bed it immediately felt "wrong".  Normally when I put the mask on, I breath through it before attaching and make sure it's positioned properly, then I attach the hose, lay down and start the machine without ramp.  I can now fall asleep in a few min or less.  Last night when I turned the machine on, it felt wrong.  Normally I can feel the pressure and I gradually get used to breathing in and out, and if I open my mouth, the air rushes out.  Last night it felt like the pressure was lower or something when I breathed in (felt like I wasn't getting enough air) and it was hard to breath out, like the machine was trying to stop me from exhaling. When I opened my mouth the air didn't flow out like it normally does.  I restarted the machine, checked the mask but it just stayed like that.  I did go to sleep but took it off after a few hours.  Graphs below from last night then next to it a great night two days ago.

Any idea what is wrong?

           

[OpalRose]

jamwin,
The only thing I noticed is you were experiencing some leaks. It could have been that when you first started your machine, your mask wasn't sealed properly.

If it just happened the one night, I wouldn't be too concerned about it.