Which hormone is involved in regulating the sleep-wake cycle?

Which hormone is involved in regulating the sleep-wake cycle?

  • Melatonin
  • Serotonin
  • Cortisol
  • Adrenaline
The correct option is: Melatonin
Melatonin, produced by the pineal gland, helps regulate the sleep-wake cycle by signaling when it is time to sleep.
Tags: melatoninsleep-wake cycleendocrine system