my wife, aged 86, arose from her nap with dizziness
Probably orthostatic hypotension, more details are needed.
Hello dear and welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.
There are many medical conditions that can cause the symptoms of your wife.
It can be an orthostatic hypotension.
It is a form of low blood pressure that happens when you stand up from sitting or lying down.
More details are needed to help me through the diagnosis.
Have these symptoms happened before?
Does your wife suffer from any other medical conditions and is she taking any medication?
Has she lost weight recently?
Does she eat a healthy diet and does she drink enough liquids?
Meanwhile, I recommend her to increase salt in the diet and drink liquids.
I also recommend her to us vitamin B12 supplements.
Hope I have answered your query. Let me know if I can assist you further.