At about age 10, sleep duration tends to be what, and what circadian change occurs?

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Multiple Choice

At about age 10, sleep duration tends to be what, and what circadian change occurs?

As children grow, sleep duration tends to decrease a bit and their internal clock often shifts to later times. Around age 10, the typical nightly sleep duration is 8 to 9 hours. The circadian change is a phase delay, meaning the biological clock runs later, so bedtimes are later and it can be harder to fall asleep at an earlier time. Shorter sleep like 6–7 hours isn’t typical for a 10-year-old, while 10–11 or 12–13 hours fits younger children better; a phase advance would imply earlier bedtimes, which isn’t the usual pattern at this age.

As children grow, sleep duration tends to decrease a bit and their internal clock often shifts to later times. Around age 10, the typical nightly sleep duration is 8 to 9 hours. The circadian change is a phase delay, meaning the biological clock runs later, so bedtimes are later and it can be harder to fall asleep at an earlier time. Shorter sleep like 6–7 hours isn’t typical for a 10-year-old, while 10–11 or 12–13 hours fits younger children better; a phase advance would imply earlier bedtimes, which isn’t the usual pattern at this age.

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