In some animals, lateralisation is simply a preference for a single paw or foot, while in others it appears in more general patterns of behaviour.

在一些动物中，侧化只是对单爪或单脚的偏好，而在另一些动物中，则表现为更普遍的行为模式。

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"We split the data in this way because older adults, especially women, tend to report more insomnia as they age, and sleep patterns in general start to change, " McClain says.

CNN: Exercise plus sleep may lower cancer risk in women