+The [Pineal Gland](/wiki/pineal_gland), a tiny endocrine gland nestled deep within the [brain](/wiki/brain), is often called the "third eye." It produces [melatonin](/wiki/melatonin), a hormone critical for regulating sleep patterns and the body's [circadian rhythm](/wiki/circadian_rhythm). This small gland thus subtly guides our internal clock.
+## See also
+- [Endocrine System](/wiki/endocrine_system)
+- [Hormone](/wiki/hormone)
+- [Sleep](/wiki/sleep)
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