Before you rush to the pharmacy to buy sleep medications, try natural sleep therapies.

在你冲到药店去买睡眠药物前，试试看自然睡眠疗法。

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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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Napping during the day will interfere with your natural sleep patterns, if you do choose to nap, limit it to 30 minutes per day.

白天打盹会影响到你的自然睡眠模式，如果你选择打个盹，每天限制在30分钟以内。

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The team was looking for a natural clock in the body that controls sleep and wakefulness.

VOA: special.2009.08.26

Melatonin is a hormone produced in a gland in the brain, and helps maintain the natural cycle of sleep and wake.

BBC: NEWS | Health | Sleep supplement asthma warning

People under harmful stress lose the ability to re-engage the parasympathetic nervous system, which drives the body's day-to-day natural functions, including digestion and sleep.

WSJ: When Stress Is Good for You