The statement that holds true about sleep is; the sleeping state can be immediately reversed; option D.
Sleep is a semi-conscious state of the mind and the body in which the body rests in order to recover from a strenuous activity.
The sleeping state can be easily reversed to full consciousness when the person sleeping is awoken.
In conclusion, sleeping is not a permanent but a reversible state.
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Note that the complete question is given as follows:
Which of the following holds true regarding sleep?
A. The conscious mind and the outside world completely draw a blank.
B. The sleeping state is irreversible.
C. The sleeping state has the conscious mind perceiving all the sensations of the outer world.
D. The sleeping state can be immediately reversed.
