Final answer:
The sequence of events associated with sleep involves the hypothalamus signaling the thalamus, which then signals the forebrain. Melatonin, secreted by the pineal gland, plays a role in regulating sleep-wake cycles.
Step-by-step explanation:
The sequence of events associated with sleep involves several brain areas and hormone secretion. The hypothalamus signals the thalamus, which in turn sends signals to the forebrain. The suprachiasmatic nucleus in the hypothalamus signals the pineal gland, which then secretes the hormone melatonin. This hormone, melatonin, plays a crucial role in regulating sleep-wake cycles. Therefore, the correct answer is the hypothalamus signals the thalamus, which in turn sends signals to the forebrain.
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