Which is the main difference between sleep and rest?

A) In sleep,the body may respond to external stimuli.
B) Short periods of sleep do not restore the body as much as do short periods of rest.
C) Sleep is characterized by an altered level of consciousness.
D) The metabolism slows less during sleep than during rest.

Sleep

A naturally recurring state of mind and body, characterized by altered consciousness, relatively inhibited sensory activity, and inhibition of nearly all voluntary muscles.

Rest

A period of relaxation, sleep, or inactivity, especially after a period of work or strenuous activity, allowing for recovery and rejuvenation.

External Stimuli

Any factor, force, or influence from outside the body that can evoke a physiological or psychological response.