Find the arc length of the curve 
from y = 1 to y = 2.
Definitions:
Spontaneous Brain Activity
Neural activity within the brain that occurs without external stimuli, often observed in resting-state functional connectivity studies.
Stimuli
External elements or occurrences that influence physical or psychological responses.
Dreams
A sequence of thoughts, images, and sensations occurring in a person's mind during sleep.
NREM Sleep
A phase of sleep characterized by non-rapid eye movement, consisting of stages 1-3, each deeper than the last, and associated with physical and mental restoration.
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