High-pressure Hong Kong is nicknamed the city that never sleeps. Most of us manage to string some shut-eye together, but you may well suffer from sleep disruption, which can leave you feeling shattered when morning rolls around.
Research shows that a week of patchy sleep can stymie hundreds of genes, raising the risk of a range of life-threatening disorders linked to stress and inflammation.
According to sleep expert Professor Derk-Jan Dijk, who led the research at Britain's University of Surrey, sleep is a "pillar of health" just like diet and exercise.
A common sleep disruptor, according to pharmacist Tim Linnet, is that central nervous system stimulant, caffeine. Caffeine's "half life" - the time it takes for its levels in your body to halve - is five hours. So your unwanted wakefulness may stem from an afternoon coffee's residual buzz.
The fast way to come down from your caffeine high is to take a dietary supplement used in traditional Chinese medicine called "rutaecarpine".
This is a bitter alkaloid occurring in the wuzhuyu (evodia) fruit from a broadleaf tree that is native to China. Take it before going to bed, Linnet suggests.