I have a finger pulse oximeter which seems to always show lower numbers when my hands are warm, and higher when cold. No idea why, but it isn't my main point here.
My sats can start at 90 - 94%. When I take a few deep breaths they rise to 97% (never any higher for some reason) but then drop straight back down to the lower numbers after a few seconds. Walking for even a few seconds also drops my sats and I appear to choke in my sleep.
Why do my sats drop so fast? I felt my lungs inflate so surely air got in, right?
EDIT: Side note, I can't even hyperventilate. My sats stay stuck at 97% and I never get pins and needles etc.