I'm a green tea drinker and I've actually read that small amounts of caffeine throughout the day are okay. Seems to be working for me. Went from coffee to black tea to green tea and have been primarily drinking green tea for 2-3 years now.
That would depend on whether you are fast- or slow- caffeine metabolizer. For example, I am of a latter kind - I can drink few shots of espresso, then go to bed in an hour after that and pull of a full-night sleep.
I don't know if "do not consume caffeine" is more important than "do not do cocaine", but otherwise I'd agree. That said, I personally care more about my Coke fix than I do about any impact to my sleep schedule.
This is not necessarily true. In particular: "2. Black and green tea manufactured from leaf from the same bushes on the same day will have virtually the same caffeine levels (within +/- 0.3%)"
Most importantly, do not consume caffeine. No coffee, no tea!