Oh yeah if you call 7 hours of sleep Exhaustion.
My First EPU would be something I never want to re visit again.
After the procedure in recovery I felt so tired I could hardly keep my eyes open...DH drove me home and I went straight to bed and slept for 7 hours!!! What a joke.
My last EPU I had NOTHING no sedation or any other drugs...I was wide awake and loved every minute of it.
Don't get me wrong it was painful but it was all over in 15 min and an hour or it ended I was at home on the lounge resting...no pain at all.

Maybe have a chat with the anaesthetist before you go in and ask for a lower dose, or what other options he/she suggests.

Good luck again for your EPU on Monday