They know they need more sleep, but they aren't getting it. In fact, double the number of people sleep more than 8 hours on weekends as do during the week. Keep regular hours. Cut down on stimulants. Consuming stimulants such as caffeine in the evening makes it harder to fall asleep.
Stimulants also prevent deep sleep and increase nighttime awakenings.
Sleep on a good bed. It's difficult to get deep, restful sleep on a mattress that's too small, too soft, too hard or too old. It won't provide the comfort and support you need to rest well. Smokers take longer to fall asleep, awaken more often and spend less time in deep sleep. Drink only in moderation.