Even with my oxygen on ,4 ltrs, When I change clothes at night, my oxygen drops to 83. I walk about a dozen steps then undress ,redress for bed . I am level 4 . None told me about a level 5. My husband does help me with showering and with my cooking , I am very lucky to have paid help with house cleaning . Still family members say , “ she doesn’t look sick”. It’s a hard disease to fathom and harder to live with . Blessed Be all of you , Crystalina