Final answer:
The hypothalamus, melatonin, and endorphins are important biological structures and processes involved in regulating sleep.
Step-by-step explanation:
Some of the biological structures and processes that regulate sleep include the hypothalamus, melatonin, and endorphins.
The hypothalamus, a region in the brain, plays a crucial role in regulating sleep by controlling the body's circadian rhythm.
Melatonin, a hormone secreted by the pineal gland, is involved in the sleep-wake cycle and helps to regulate sleep patterns.
Endorphins, a type of neurotransmitter, can promote feelings of relaxation and contribute to sleep.
Learn more about Biological structures and processes regulating sleep