I understand. ( ( ( Dawn ) ) )
Have you given him permission to let go?
We told Dad "it's okay Dad, you can let go now. We'll be okay"  ( I expanded on
that a bit on that and told him about siblings/relatives that I knew he was
concerned about).  I don't know that it changes how long a person hangs on, or
not, but I think it's something we'd all want to hear about the loved ones we
leave behind

I don't know if you were paying attention when we talked to others about what
might happen.
His mouth and eyes will be drying out if he's not getting hydration. The nurses
will use balm for his lips and drops for his eyes and/or mouth. His kidneys will
slowly shut down (less urine) and his feet and sometimes hands will take on a
darkish/bluish colour as the last days/hours approach.  His breathing may get
shallower and sometimes stop/restart and then at some point, it won't restart
and he'll be "declared" gone. But do stay with him and talk with him a bit more,
if you feel that you'd like the time alone with him (because I believe the
hearing/brain continues for a bit longer).

If they allow a recliner, you may wish to snooze there so you can be there with
him, but don't feel you have to just because I suggest it. You may need time
away yourself.

Many hugs luv,
J