Over 50% of Indians polled experience sleep-related issues due to inconsistent bedtime routine: Survey / People in industrialised societies sleep better, research finds / People in industrial societies get more sleep than hunter-gatherers / The sleep trend taking the internet by storm / How sleep tourism became a booming business for hotels / Sleep is a booming business. Here's why that's a problem / What is Sleep Tourism? Here's Everything You Need to Know About a Sleep Vacation / 7 simple changes that can help you thrive as a night owl with a 9-to-5 job, from a Harvard sleep expert