If your body is naturally cool or your circulation isn't the best, add an extra layer of heat from an electric blanket, heating pad or hot water bottle before going to bed.

如果您的身体自然降温或您的流通是不是最好的，增加额外的层的热量从一个电热毯，加热垫或热水瓶之前睡觉。

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But in a central neighborhood where luxury apartments stand next to 1920s-era lane houses, Ms. Niu and her husband are crammed under the stairs of an old home in a windowless room that fits little besides their single bed and electric hot plate.

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