My Husband Had A Oxygen Deprivation Incident In 2013. The

My husband had a oxygen deprivation incident in 2013. The blood pressure dropped so low that his kidneys shut down for two months. Currently he is experiencing depression, he sleeps all the tme. I mean 20 hours a day most days. He alooked acts out in his sleep, like sitting up and eating, taking medication, or lifting weights. He also said he has conversations with people who have passed, I mean real conversations. I am really worried. His memory is all but gone. I don't know how to help.