I had surgery which involved a metal bar being put in my chest...
With waking up, it seriously feels like you went to sleep like 5 minutes ago but also like you have had the best, most refreshing sleep ever ha ha.
Although my mum said I woke up, looked around , grunted a few times, slurred a few words and then went back to sleep for about 6 hours.
You won't have many problems if your hooked up to morphine or pills, regarding to having pain, also the morphine can be quiet amusing if you've got your own supply button ha ha
Good luck with your surgery and all, nothing to worry about mate.
Ive got another surgery coming up in September to remove the bar and I'm not scared at all,
I'm just not looking forward to sitting in hospital for another week.. (I have the attention span of a wall nut ha ha) seriously hospital is so boring so make sure you take lots to read and have lots of fun games on your phone etc...