How to help your teenager get enough sleep

How much sleep do teenagers really need and why do they feel the urge to stay up so late? Teenagers need more sleep than adults and their circadian rhythms are actually different, says parenting expert Nathan Wallis. On average, a teenager's body clock moves forward around two hours so, effectively, we can think of Kiwi teens as operating on Sydney time - "they're two to three hours out from the rest of us." He gives parents some tips.