I woke up around 1:30 a.m and saw a woman about 5"10 with her arms folded standing in my doorway. I asked her loudly "who are you" and she disappeared. My daughter heard me yelling but was in bathroom
And saw nothing . I recently put my younger sister in a nursing home who use to be a nun. I am so weirded out.

Get off drugs or see a doctor.

I look at that as you were in between consciousness between your rem and waking... the prior person was rude. Your penial gland was active and that is a common time for when you are able to see things. It is quite possible that she was there... just pray about it. Spirits come and go and pass by. Family members check on you... so it can happen for sure. Don't think you are crazy. I have gotten up from my bed been wide awake and saw a woman standing over me saying "would you like a piece of cake?" and I looked at her like "no thank you that is quite alright"... then she disappeared. I was fully awake because I got up and looked around the room as well. I was maybe 22... not on drugs... not drunk... Not over tired not on drugs that cause hallucinations so you know what? It truly could have been legit. Just pray about it and ask Him and talk to Him about what you have experienced.

Your sister being in a nursing home and being a nun has nothing to do with anything. How long have you been in the home?