Interesting sleep trick: Black Tea to prevent napping?

I've been having a split sleep schedule for months now. I end up napping for 1-3 hours a day, and then staying awake. Then I end up going to bed between 2 and 3 am. I then get up at 6, 7, or 8 for work, and am sleepy during the morning till about 12. Last night was the first night in months that I have slept 7 hours at one time. The thing that I did differently was to have black tea when I was scrapbooking (that has caffeine). I would like to try this again ... to see if it can help me normalize my sleep by the caffeine helping keep me awake during that lag time where my body wants to nap.