You can create 2 Wills now while you're healthy and of sound mind. Both are written and signed and possibly notarized. The first is a LIVING WILL which essentially lays out everything you would want someone to know: birthday, blood type, medical conditions, ID numbers and so on. You would state clearly your wishes that if you are found unstable (as with a stroke) and you require life support should you be near death that yes or no you wouldn't want this. State clearly you want your body when you die to go to science. You would place this signed document in a safe place and then leave a note near your computer or bedside in the event you pass away. You can put the Living Will in with your books or where someone could easily find it if they needed to. If you're able, carry it on your person. Second is a Will, this has all your final wishes in it, where you'd want your personal items to go, what to do with any left over money, etc. If you don't say, those in your family might lay claim to it. You can leave both Wills in a binder or folder and either take it with you to the hospital or tell at least one person with whom you trust as to where it is. You can Google or research more about Wills for your country, state, etc. so that you're Wills are legal and cannot be contested in court.