她睡觉时磨牙。
一些人睡觉时紧咬牙关或磨牙，这种情况称之为磨牙症。
Some people clench or grind their teeth while they sleep, a condition called bruxism.
如果你经常醒来的时候有轻微的头痛或下巴肿痛，你可能是在睡觉的时候磨牙或者紧闭牙关，被称为夜间磨牙症。
If you often wake up with a dull headache or sore jaw, you may be grinding your teeth or clenching your jaw while you sleep, a problem called bruxism.
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