What is it like to wake up in the hospital on morphine?

I am an author and I have a character who wakes up in the hospital on morphine or something similar. If you have woken up in the hospital before, especially if you were on painkillers, I would like to know what woke you up, how you felt when you woke up, how long it took you to realize where you were, how the painkillers made you feel (especially how they affected your mental acuity and your appetite). Any other details you remember would be helpful (things about the way the hospital staff treated you, how long you were in the hospital and what type of injury, etc)
Asked Oct 01, 2017

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