Hiding pills? I don't think I could ever do that. I have never lied to DH (I'm not a good liar at the best of times) and that would feel like lying as well as showing great disrespect. At his age, he has the right to determine -- as much as possible -- the rest of his life. I am his wife. I may end up being his caretaker as well, but I am not his mother.
While I was not above tricking the children at times, tricking DH is not something I can or will do. Besides, it is difficult to wake someone from a sound sleep to "trick" them into eating applesauce at midnight, yes? These meds are taken every six hours. That's a lot of tricking and pretty darned suspicious.
I realize that logic becomes a thing of the past, but if I cannot convince DH to take medicine for his health, I fall back on my ace card -- take it because I love you. My mantra since his head injury has been, "I love you and I will never knowingly do anything to hurt you. You can forget everything else, but you have to remember this." Many times a day I repeat this to him in different ways.