The amount of sleep we need each day varies throughout our ____. National Sleep Foundation guidelines advise that ____ adults need between ____ and ____ hours of sleep per night. A ____ children spend most of their time in ____ sleep, as they have around 14 to 17 hours of sleep. Shift work can ____ impact sleep. It ____ the body's normal alignment with the 24-hour sleep-wake cycle. Shift workers often get two to three hours less sleep than other workers, and they may ____ to sleep during the day due to their work ____.

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