(KRT) – Despite what generations of parents have thought, teens who stay up half the night are not simply being rebellious. Research shows that biological changes during puberty “reset” an adolescent’s internal sleep-wake clock, programming teen bodies to go to sleep and wake up later. Woman’s Day magazine helps you get your teen back on track with tips to help him get the rest he needs, including:

• Provide a weekend wakeup call. To keep their internal clock on track, teens should go to sleep no more than an hour later and wake up no more than two hours later on the weekend than they do during the week.

• Encourage him to avoid a java jolt. Coffee drinks are the new soda. Tell your teen to just say decaf.

• Keep the computer and TV out of the bedroom. Not only are they tempting distractions (why sleep when you could be surfing the Web?), but if a teen drifts off with them on, the light and sound can interfere with sleep.

• Take steps to stop late-night cramming. Telling your teen that cramming for a test doesn’t work may not be enough. Help her develop – and stick to – a study plan a couple of weeks before a big test.

For more tips, pick up the latest issue of Family Circle magazine or visit www.familycircle.com.