For me it tends to be the mornings and dinnertime for the most part.
When I sit and have my morning coffee and he don't come out to join me is very hard. This usually sets off my morning tidal wave of tears. Dinnertime is tough too but then there is always the escape from reality I can achieve through sleep. Sometimes I have dreams about him, this provides me with temporary comfort.
I am sorry for your pain, I know it hurts. Interesting in that I don't recall dreaming of my spouse. Now, of course, I'll probably dream of her and wake up in tears.
Thank you and sorry for your loss as well.