Restful sleep is important in maintaining one's clear thinking and long term memory. During each night our deep sleep provides a cleansing of the brains waste byproducts; readying it for the next day. It also helps to organize our thoughts into long term memories.
Where are our memories stored?
Memories are formed in the Mammillary bodies of the brain. These are small structures on the under surface of the brain. Research has shown the Mammillary bodies of Sleep Apnea patients are significantly smaller than that of normal patients. Article