Ideally you should get all what you want done, or not done, in place and agreed with your Medical POA and advanced care directive while you are fit and healthy. My mum - who worked as palliative care Nurse/Sister for years, and was a member of Exit- chose what day/time was right for her to depart. Biggest mistake she said was that too often people waited until they were in a dreadful situation- wanted it to stop- but had lost the capacity to do so and had put nothing in place re what they really wanted.