Our lives are so chaotic nowadays, most people do not get enough sleep. This may exacerbate your depression.
The optimum amount of sleep a person needs each night varies from person to person. If you feel sluggish around mid-afternoon or anytime during your day, you may not be getting enough sleep. Short-changing yourself on sleep is a surefire way to increase feelings of sadness in your life.
If you're feeling blue and tired, try to increase the amount of sleep you're getting at night. Often, giving your body enough rest will cause you to feel better about yourself and your circumstances in a few short days.