Hi Cate, I'm not overly concerned as during the day my sats are normal and yes, the readings are the same with finger pulse oximeter when I do any readings during the day. It's possible it's movement, or watch fit, but to be on the safe side, I'm being sent an overnight pulse oximeter from the hospital, should get it in the next month or two. No-one here seems to be worried about it (I'm in New Zealand though). Yes, sometimes I have trouble breathing and yes, wake up in a panic being strangled or crushed in my dreams, and yes I am always tired, but then I'm on treatment for NTM so I sort of don't really expect much else! I thought it may be of interest though to doctors and others on treatment elsewhere as a possible side effect.