My mom's O2 levels are very low. It keeps to as low as 83 and the max is 89...She's on O2 2% overnight , but lately needs it 24h/day...She refuses to use bipap.. I try everyday and max I get is 15 min ( when I'm lucky)...she has bulbar als. how bad is this o2 level? Im very worried..Shes restless at night and says she can feel the end coming...it is so heartbreaking to watch she struggles all the time ... What should/ can I do to help her?