energy boosters

I had a slight headache so I popped a couple excedrine tension headaches....the headache is gone and within 5 or 10 minutes I was wide awake and alert feeling (and happy....I'm grouchy when I'm tired). I know it's from the caffeine in the pills, but I loved the instant awake.

I obviously don't want to pop an excedrine anytime I feel tired, and I don't drink pop much anymore and I'm not a coffee drinker. Are there any safe, natural (sorry don't like tea if that's a suggestion) supplements or anything I can take to wake up now and then?

Note: my sleepiness seems to have no rhyme or reason. I've been dragging all week and last despite getting 7-8 hours of sleep a night and falling asleep pretty quickly once in bed. It seems I can get plenty of sleep and still be tired, other times get almost no sleep and be energized. My body makes no sense.