Hi, you raise a great question as long as you are willing to answer it deeply rather than what some people do - committing physical suicide (doesn't answer it) and what other people do (superficially and intellectually analyze it.)
Are you really capable of lying in bed all day? Just doing that? Nothing else? No intending? No expecting? No resisting? No assuming? No physical moving? No labeling? No comparing?
The fact is, as a separate subject as a self, there is no reason for you to do any of those things, you are right! As a self you feel yourself to be evaluating and acting on those evaluations, but those evaluations are fabricated no? They are meaningless. So truly try laying in bed, truly stop intending, die before you die as Ajahn Chah has said.
Once you die in this sense, once you drop the last five fetters and are no longer I-making, then your actions are simple cause and effect, suffering (physical or mental) is seen somewhere in the aggregates of either yourself and others, and the aggregates are galvanized to act automatically. You even experience this now - say there is an itch, you often don't even notice the scratching of it, there is no deep philosophical confusion.
Please, attempt to die before you die, lay in bed or sit on a cushion and just stop. Report back on what happens, hopefully you will be an arahant when you do. If not, don't worry - practice makes perfect.