Zàoyùzhèng bìngrén yǒushí xīngfèn de zhěngyè bú shuì, yǒushí yòu xiāochén de shénme dōu bù xiǎng zuò.
People with bipolar disorder are sometimes so excited they don't sleep all night, and at other times so low they don't want to do anything.
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躁郁症 is the everyday name. Doctors say 双相情感障碍 (bipolar affective disorder), often shortened to 双相. 躁 is the manic side and 郁 the depressive side; don't write 躁 as 燥 (dry).