Orexin, also known as hypocretin, is a neurotransmitter that regulates arousal, wakefulness, and appetite.
These are chemical messengers used by neurons to send signals across synapses (the tiny gaps between neurons).
This refers to our 24-hour daily sleep pattern which consists of approximately 16 hours of daytime wakefulness and 8 hours nighttime sleep.
A hormone predominantly made by adipose cells that helps regulate energy balance by inhibiting hunger.