According to your textbook, if sleep problems persist beyond you should consult a medical professional. 27. one month three months five days two weeks

three months.

Explanation:

According to the webmd on sleep disorders, if you have trouble sleeping at least three nights a week for over three months, its time to seek a professional because you're probably experiencing chronic insonmia, that can be cured with some pills to make you more relaxed to sleep and behavior terapies, to understand what mental issue is causing you having a hard time falling asleep.

true x

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