Sleep & Pain. Sleep at nite about 5hrs and wake feeling nauseous, and ideas why?

I am currently 1 week post-op. I seem to only be able to sleep 5 hours at a time at nite. I do not take naps during the day. My main concern is that I feel nauseous when I do wake up and wonder why? I eat small amount of Jell-O and then i'm fine. I would like to sleep thru the night. I used to have to take Diphenhydramine (Benadryl) to help me sleep. Can I take this now?

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