This could be due to the effects of our natural sleep-wake cycle, or circadian rhythm, the researchers suggest.

研究者表明，这是由于我们的自然睡眠-觉醒周期或者昼夜节律的影响。

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Their sleep/wake cycle lengthened suggesting the brain mechanism that controls the timing of activity and rest had been affected.

它们的作息周期变长，表明控制作息时间的大脑机能受到影响。

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Get active outdoors between 6:30 and 8:30 a.m.; it's the prime window to wake your body with sunlight, kicking off a healthy sleep-wake cycle.

早上6：30——8：30进行活跃的户外运动；这是通过阳光唤醒你身体，开启健康的醒睡周期的主要窗口。

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You start off and you go down, down, down, and then you come up, then you get your first REM cycle, again, again, again, again, again, and then you wake up.

从第一阶段开始，到下面的阶段，然后又往上，这时就出现REM睡眠，然后再一次次地循环，直到你睡醒。

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Impairment in the body's internal clock, ultimately disrupting a person's sleep-wake cycle, is just one of the potential symptoms of dementia.

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Melatonin products are usually synthetic versions of the hormone made naturally by the pineal gland, in the brain, which helps regulate the body's sleep-wake cycle.

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Sharing a bed may also reduce cytokines, involved in inflammation, and boost oxytocin, the so-called love hormone that is known to ease anxiety and is produced in the same part of the brain responsible for the sleep-wake cycle.

WSJ: Who Sleeps Better at Night?