many manufacturers have guidelines to follow and they are going to be super-safe as they don't want to be sued. i use aptamil for my nightime feed and i'm happy keeping it for 24 hours in the fridge if need be. no longer than that though.
i think their guidelines are for if the bottle is left at room temperature...? can you get a mini fridge for the bedroom?
i think their guidelines are for if the bottle is left at room temperature...?