REM Sleep: Tear Secretion and Dreams

Although a number of hypotheses exist to explain the reasons for the rapid eye movement (REM) phase of sleep, the physical movements themselves have not been explained or interpreted in the literature. The author theorizes that REM during sleep serves not only to increase the lacrimal secretion and to humidify and lubricate the ocular surface, but also to redistribute the secretion on the ocular surface and to inform the conjunctiva-associated lymphoid tissue (CALT) system. He hypothesizes that when eyes move in REM periods to humidify the ocular surface, they indirectly release phenomena of the visual activity, producing dreams.