In my experience, many of the negative effects are greatly reduced. When my dad first brought back a box of PG Tips from a work trip in London, I discovered I could drink like, ten cups and still function. Only moderately burned out.

If I had drank the same amount of coffee I'd've needed to lay down. It was great for all nighters playing Halo multiplayer.

All this time I thought tea's superiority was due to it having "more hydration" or something. This is so interesting to know!