Operating System (OS)
You should choose sleep option when

When computer gets hanged frequently. Let it sleep for some time
You finish working and going to bed
You are leaving for a very short time and want to resume you work shortly
The computer is tired after working for the whole day

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Operating System (OS)
The instruction register

None of these
is a hardware memory device which denotes the location of the current instruction being executed.
contains the address of the memory location that is to be read from or stored into.
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".

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