ResMed F30 Leaves me Thirsty

[captnrontx]

I recently began using the ResMed F30.  I did this because I am a mouth breather and I was told by my Doctor that this was a good option.  My question is that some nights it works great, but other times I awaken many times needing a sip of water.  Could it be the mask is leaking, but I can find no evidence of that when I awaken. Could it be that the machine reservoir is low on water?  Suggestions?

[HalfAsleep]

2 possibilities:

1. Your lower jaw is dropping open when you sleep. Many posters use foam cervical collars to solve this problem. You will see much discussion about this on the forum.

2. Check your humidifier and hose are plugged in correctly.