Is the a normal sleep behavior or should I be concerned?

My dear aunt has on more than one occasion upon waking up after cat napping in her chair, has trouble walking talking,ect. After a few min she is fine. I've told her that she is just sleepy but the last time it happened it scared us both,she was white as a sheet when I went in to wake her, even her lips, I watched the color come back into them as she tried to talk to me. I had to help her stand and she couldn't pick her feet up to walk. After struggling to get to her table to take her meds she was having slurred speech, and a hard time finding words,she barely made any sense. She continued to have a hard time walking into the bathroom to get dressed but by this time speech was better. She continued to be kinda weak as I got her into bed. She is afraid to cat nap now. Is this just a sleepy episode or something else? She has suffered a stoke and has harding of the arteries and diabetes. Is this pretty normal?