India, Nov. 7 -- After seven cups of coffee, the working day is finally over, but you still feel tired? Caffeine won't solve the problem in the long term. Tips for getting through the day with enough energy. Berlin (dpa) - "Don't talk to me until I've had my coffee" is a popular phrase emblazoned on mugs. No wonder - many of us need that morning caffeine jolt to get into gear and be halfway able to interact with fellow humans. But might there not be a better way? How about getting a good night's sleep? Overly simple though it may sound, how energized you start the day substantially depends on how well you slept, on how much of your sleep requirement you met. "For most adults, it's between seven and nine hours," says Emma Erhard, team measur...