Being consistent reinforces your body's sleep-wake cycle and helps promote better sleep at night.

坚持这样能加强你身体休息周期并且有助于晚上良好的睡眠。

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By sleeping late on weekends, Macejka was disrupting her the sleep-wake cycle for the whole week.

由于周末总是睡到很晚，马切伊卡打乱了周中的作息模式。

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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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And then you do twenty-plus miles the next day,you sleep in a tent, you gotta wake up and you got to do it again.

VOA: special.2009.11.02

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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In another experiment the researchers wake up sleeping mice by sending a light signal to the hypothalamus, the brain's controller of sleep-wake cycles.

FORBES: Magazine Article

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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