Motivation gets you started, good habits keep you going. Just as Henu said, if you have absolutely nothing to look forward to in life, this can explain your situation. Set some goals, work on them.
Success is the progressive realization of a worthy ideal. As you see yourself making progress towards your goals it will be hard for you to stay in bed, just because you would be wasting time and not moving forward to achieve what you have set out to do.