Their shadows slept, or almost slept, upon the water, a gentle quivering alone showing that it was not complete sleep, or if sleep, that it was sleep with dreams.

它们的影子熟睡着，或是半睡着，一次轻微的抖动表明它并没有完全睡着，或者即使是睡了，也是做着梦的。

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Also see a doctor if your child's sleepwalking is influencing the sleep of other family members, or if you're worried your child might hurt himself while sleepwalking.

如果你的孩子梦游影响了其他家庭成员的睡眠，或者你担心你的孩子在梦游时可能会伤到自己，也要去看医生。

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If you try these tips and can't seem to relax, or your sleep continues to worsen, be sure to reach out to your doctor or a mental health professional.

如果你尝试了这些建议却似乎无法放松，或者你的睡眠状态继续变糟，一定要联系你的医生或心理健康专家。

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Overweight people often have sleep problems -- most notably sleep apnea, a breathing disorder that causes frequent awakenings -- but it's not clear if they're overweight because of their sleep problems, or if their sleep problems result from being overweight.

CNN: Sleep deprivation spurs hunger

It explains what to do if caught on a sinking ship or in a depressurised aircraft, how to sleep in space, and how best to survive if caught outdoors in extreme heat or cold, or in an open boat.

ECONOMIST: The science of survival

If you find yourself unable to sleep because of work stress, or if you are feeling so strained that you take it out on the people you love, it's time to re-evaluate your workload.

CNN: Overworked or challenged at your job?