(1) Prostaglandin D2 is essential for the maintenance of the sleep state. (2) The adenosine and A2A receptor system is a link between the humoral and neural mechanisms of sleep-wake regulation. (3) Prostaglandin D2 plays a crucial role in the homeostatic regulation of NREM sleep. Finally, it may not be too far-fetched to say that prostaglandin D2 was most likely the endogenous sleep substance described by Piéron and Ishimori about 100 years ago, and possibly the sleep-inducing factor reported by Professor Jouvet and coworkers some twenty years ago.
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College of Veterinary Medicine, Konkuk University, 120, Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea. Electronic address:
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