I'm sorry you are both a horse and your Anakin is in a dreamless sleep. Can I ask you to keep an eye on him while he is like this and let me know if anything changes for either one of you? I'd like to set up an IV for him, to keep him hydrated and fed while this is on-going.
I would recommend shifting them and keep them clean via sponge bath while this is going on, to prevent bedsores. A quick google search can help with both, but please let me know if you need me to send someone over to assist you because you're a horse, or need any other advise.