I generally avoid this kind of thing with higher level characters or if I am actually trying to accomplish something in a timely matter. But for lower level immersion I may eat and drink 2 or 3 times a day and get 7 or 8 hours of sleep each night. In addition, I would usually avoid endless sprinting unless there is RP justification of some sort and prefer to jog along roads instead, ( I do not have enough patience to actually, 'walk')
Also, there are a myriad of other things to create realisticness, such as waiting an hour after reading books or not drinking age old potions in Nordic ruins infested with walking dead.
Just wondering what others might do to increase their immersion.