TINY TWEAKS

BECOME a morning person by taking exercise before or at lunchtime, says Russell Foster, a professor of circadian neuroscience at Oxford University. Exercise and morning light can set your body clock. In a recent study, around 100 people walked or ran for an hour at different times of the day over three days. Those who exercised between 7am and 3pm woke earlier, while those exercising later (7pm to 10pm) woke later, reported the Journal of Physiology.