![]() "It's hard to imagine now a world where your patterns of sleeping and waking up again were directly influenced by the setting and rising of the sun," Handley told Live Science.Īnother simple, but notable fact is that the people of yore had no way of soundproofing their houses against the noises of the outside world, like we do today, Handley added. ![]() But it's possible that this orientation also enabled people to wake with the sun's rays. Their reasoning was partly religious, because the east was believed to be the direction from which Jesus would come during his resurrection, she said. In her research on Britain's historical sleeping practices, Sasha Handley, a senior lecturer in early modern history at the University of Manchester in the United Kingdom, has discovered that people during this Christian era would often orientate their beds toward the east - where the sun rose. In an era before alarms, Jackson says it's probable that this is how people woke up, cued by the accumulated hours of sleep, paired with the rays of the rising sun. This process is also affected by light and dark, meaning that periods of alertness and sleepiness usually correspond with morning light and nighttime darkness, respectively. ![]() Overlaying this, the circadian rhythm - also controlled by cells in the hypothalamus - is a parallel process that regulates phases of sleepiness and alertness over the course of a day. ![]()
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