Moreover, cognitive and mood problems may not be the only consequences of too little sleep.

不仅如此，睡眠过少的后果可能不只是认知能力和情绪问题。

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Failure to do this effectively may be the root of some post-natal mood problems, they said.

BBC: Chemical clue to baby blues found

The main hormone produced during stress is cortisol, which causes aggression and and mood problems.

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For decades some doctors have complained these drugs are overused for mild mood problems.

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