You eat at a decent hour before 6 p.m., turn off all electronic devices, shut off the lights and force yourself to go to sleep on time — and yet you still wake up with zero energy. Sound familiar? Feeling tired can loom over you like an ominous dark cloud of despair. Once your body feels tired, focusing can be a major hurdle, your emotions are erratic and the day seems to creep by slowly. Sometimes, taking all the necessary steps to avoid exhaustion inevitably lands you right back in the exhausted zone. Take a look at these five reasons you feel tired all the time.