Find the limit, if it exists. 
Definitions:
Reticular Activating System
A network of neurons located in the brainstem that regulates wakefulness and sleep-wake transitions.
Falling Asleep
The process by which a person transitions from wakefulness to sleep.
REM Sleep
A sleep stage characterized by rapid eye movement, dreaming, and increased brain activity.
NREM Sleep
Non-Rapid Eye Movement sleep, a restorative sleep phase characterized by reduced physiological activity and is divided into stages reflecting depth of sleep.
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