Do you have problems dropping off? Stick to a bedtime routine, to remind your brain that it’s time to relax and sleep. And don't be tempted to sneak an extra episode before lights-out. Blue light from screens has been shown to disrupt sleeping patterns and make nodding off more difficult. We sleep in cycles of about 90 minutes at a time, so coming-to partway through can make us feel groggy and disoriented. If you're getting a good eight hours but still waking up exhausted, it could mean you're waking up halfway through a cycle. Try working out when you need to wake up and count back in 90-minute segments to work out roughly when you should fall asleep. And if you're still tired, we recommend the gurus at Global Sleep Solutions, an innovative sleep clinic based at The Shard.