Is lack of sleep giving you bags under the eyes? Are you so sleep deprived that the only way to get through the morning is by drinking a triple espresso? Not being able to sleep affects everyone at some point in their life and about 10% of the population suffer from insomnia that continues for 6 months or more. Many experts recommend we get between 7 and 9 hours of sleep per night and whilst it's important to make sure we get enough sleep, it is equally important we get good quality sleep.