I too have been there with my darling Dad, OP...I well remember the final stage of our family all sitting with him through the long night hours.
Confusing time of so many conflicting thoughts: desperately sad we were finally to lose him; desperately relieved, though, that he'd soon be pain-free and at peace; very bonding with everybody's memories, be they happy/ poignant/ plain daft and funny (of which there were many!).
I'm sure you're all currently riding that same emotional rollercoaster?
It is, as you've said, utterly surreal.
During the quieter, private time alone with him, I often just held his hand and replayed in my mind special times the two of us had shared together...no words spoken or needed.
Just really tuned in to tranquil, calming and reassuring thoughts, in the hope that he'd be receptive on some level.
Remembering those throughout the grieving process very much helped me. I really hope it will do similar for you.
To have those we most care about present with us as we pass on is probably what we all ultimately wish for: it is very clear from your posts how much your lovely Dad meant, and will always mean, to you...I imagine knowing you feel that way has been incredibly comforting to him.
Sending strength and best wishes to all your family at this difficult time.
