((((((JH))))))
I am so sorry for your loss!
The force of the question of life after death hits full in the face when it gets personal. It is no longer academic, it is important because the relationship was so important. I understand your wanting to wrestle with it and not gloss over it; my mom died this year as well and the question wanted serious answering then, too.
I am of the mind that relationships are of utmost importance to God, too. There are three things that last--faith, hope, and love. And the love of God will bring us thru in the end, for it never fails. (Maybe that is the secret nature knows?)
If your father 'sleeps', it is a state unaware of the passage of time --he would not know he had slept. If your father's soul cognizantly enjoys the company of Christ right now, he is in a "realer" reality to which we are the dream. Either way, as Mary wrote, all is well.
May God bless you during this hard time, and give you peace.
bebu