Caffeine Meditation

Meditating on caffeine or for that matter any other substance can be highly contrasting to the nervous system. They work in quite the opposite direction from the way of meditation. When caffeine is ingested it remains in the body for as long as up to 9 hours. For drugs it can remain for as long as 2 weeks. During this period the quality of the experience will be dull. While there are no do and dont's in meditation, it would be wise to be intelligent about your own self development.

Meditation heals us in every way. No substance can ever truly have this effect. Excessive tiredness or improper food can also cloud the experience of meditation, but in this case the dullness does not last as long. The food is converted within two or three days and the qualities of meditation will return to normal. Remember there is no shortcut to ego transcendence.

Richard Alpert (now known as Ram Das) was one of the early pioneers of LSD in the 1960s. When he went to India for the first time, he took his drugs with him. There he met his guru, Neem Karoli Baba. Neem Karoli took a whole handful of LSD pills — a bigger dose than anyone could imagine taking. It had no effect on him. His words to Ram Das was why get high on this, get high on life instead!

Drinking tea is a ceremonial  component of the Zen tradition. Studies have shown that L-theanine significantly increases the output of alpha waves by the brain. Alpha waves are responsible for the deep, peaceful, calm feeling that is imparted by meditation, yoga and deep relaxation.

Everything in moderation comes to mind with regards to caffeine.
Understand that all substance has a dualistic nature. There is the positive and negative effects on the body, mind and the experience of your meditation. While our intent may be good, we have to keep in mind that the goal is everything. We have to also keep in mind of addictive behaviours to be wanting to experiences a certain experience. Example, we may want to experience a permanent state of peace, happiness and bliss. This need to experience the state can lead you down to a road of despair. You get caught up in chasing an illusion that you end up running in circles.

Enlightenment is stabilizing the experience of the "point" between the movements of wanting and not wanting. Meditation then is the way to that "point".