How much sleep do you actually need? The best judge of that, is you. If you feel fine on five hours a night, stick with it. Others may need 10 hours to function. Experts suggest that if you have trouble getting up the first time the alarm sounds, you should go to bed earlier. And, they also say you should have a consistent bedtime. If you have to get up for work at 6 a.m. during the week, and sleep till noon on weekends, that can be a problem.