What is the primary mechanism by which sleep restriction therapy improves sleep in patients with chronic insomnia?
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A
It increases melatonin production by limiting artificial light exposure before bed
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B
It builds homeostatic sleep pressure by restricting time in bed to match actual sleep time
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C
It trains the brain to fall asleep faster through classical conditioning of the sleep environment
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D
It reduces cortisol levels by establishing a consistent, earlier bedtime