There are some pretty good decaf black teas (not herbal) which are reasonably satisfying if you want to have a cuppa later in the day.

If you're in the US, the Stash decaf range is IMO the best of the common supermarket brands (the normal American teas like Lipton and Tetley are pretty terrible in their decaf versions). If there's a gourmet store around, they may have the English brands such as Typhoo or PG Tips in decaf, which are pretty great. If you're in the UK then any advice on tea from the likes of me should just be ignored out of hand... :)

I'm not a coffee/tea drinker and I don't drink soft drinks (caffeine or otherwise) apart from when its mixed with alcohol. I personally find it takes me a lot longer to get to sleep after having consumed pre-mixed alcohol involving things like cola. Beer, on the other hand, does not seem to have the same effect even when consumed at the same time of day.

Last year I made the decision to switch to drinking only decaf tea after 3pm, and since then I've found that I have much less trouble getting to sleep. Purely anecdotal of course, but I highly recommend it. Initially I was worried about the taste, but there's honestly not a huge difference.

Can you pick a decaf herbal tea for afternoon drinks?