Get exercise. Not only will this help with being 'tired' later - exercise also helps elevate moods. Walking is a great form of low impact exercise that everyone can do. Preferably outside in natural light. Natural light is good for moods as is are B complex vitamins!
Other things to help sleep are to keep the tv off in the bedroom - the light emitted from a tv messes with your natural sleep rythm. And the noise together will keep you in a state of light sleep.
Do not drink caffeine after 4pm. Have a BEDTIME and a WAKE TIME and stick to them. Keep sleep for the bedroom. If you take a nap in the afternoon, limit it to 20 minutes or just enough to get you by. If you continue to sleep more than an hour in the day, you can alter your sleep cycle enough that you won't need as much sleep at night and will continue with the waking.
Not sleeping suck! I hope you get some rest soon!