When spring came, the two periods of sleep started to get close, until they almost merged in summer, which is when the nap appeared. In those times of biphasic sleep, people went to bed early, one or two hours after sunset, and had a waking period of one to three hours during the early morning, which they dedicated to prayer, reading, having sex or telling stories. That is the moment in which a great awakening used to take place during the Middle Ages. After analyzing their sleep, we have seen that a significant percentage of individuals wake up between 3am and 4am. In the Chronobiology and Sleep Laboratory of the University of Murcia we have monitored 9,800 patients from whom we obtain data on their exposure to light, their activity and their sleep, seven days a week. People talk a lot about biphasic sleep these days.Īnswer. At the next congress of the Spanish Sleep Society you will give a talk on sleep in the Middle Ages. Part of this knowledge can be found in a recently published book: Cronobiología: una guía para descubrir tu reloj biológico (or Chronobiology: a guide to discovering your biological clock), where he reflects on the importance of adjusting our internal clocks to the cycles of nature, something almost impossible in a world dominated by artificial light and screens. He says he is planning to continue his research work (“at a different pace”) and share the knowledge he has gathered after more than four decades of study. The professor of physiology, director of the Chronobiology and Sleep Laboratory of the University of Murcia and one of the world’s leading experts in chronobiology, confirms this impression. But judging by the casual way he mentions it, as well as his physical appearance and the energy he radiates, it does not seem as if the milestone will put a stop to his research and dissemination work. As he poses for photographs in the lobby of the Riu Plaza España Hotel in Madrid, where he went to give a lecture as part of the 20th International Congress on Anti-Aging Medicine and Medical Aesthetics, Doctor Juan Antonio Madrid, 65, realizes that he happens to be in the Spanish capital just as his retirement is becoming effective.
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