Write the the differential equation by separating the variables. 
Definitions:
Sexual Activity
Behaviors involving the expression of sexuality or sexual relations between individuals.
Sleepwalking
A disorder that involves walking or performing other complex behaviors while in a state of partial wakefulness during sleep.
REM Sleep
A phase of sleep characterized by rapid eye movements, dream vividness, and increased brain activity.
Circadian Rhythms
Biological processes that display an endogenous, entrainable oscillation of about 24 hours, regulating sleep-wake cycles among other bodily functions.
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