Along with chapstick (though I prefer Burts Bees myself
).. I will say the single most important thing is a patient advocate with you, as much as possible.
They may not necessarily be needed to advocate on your behalf, but if you need someone, it's really important that they be there.
Mine was not there the morning directly after my surgery and I seriously needed him to be there due to an unsafe situation that was developing.
Even if all they end up doing is watching you sleep, I still would highly suggest you have someone that is there, strictly for you and you alone if at all possible..