A mid ocean ridge is made by a divergent boundary. The mid-ocean ridges of the world are connected and form a single global mid-oceanic ridge system that is part of every ocean. The mid-oceanic ridge system is the longest mountain range in the world. The continuous mountain range is 65,000 km (40,400 mi) long.
Circadian rhythms are important in determining human sleep patterns. The body's master clock, or SCN, controls the production of melatonin, a hormone that makes you sleepy. Since it is located just above the optic nerves, which relay information from the eyes to the brain, the SCN receives information about incoming light.
Neurotransmitters and Sleep by Richard H. Hall, 1998 Acetylcholine: Sleep and Thermoregulation In the first part of this lesson we discussed the characteristics of the stages of sleep, the sleep cycle, and the functions of sleep.he acetylcholine neurons that are most important in the sleep process have cell bodies in the Pons and the Basal Forebrain. The pons is located at the base of the brain just above the medulla.