I was just reading about the calming effect of green teas and how they
can actually put you to sleep. They do have low caffeine levels as
well, especially sencha and bancha. They also contain katechins, which
help your body fight off viruses. Most Japanese people have tended to
drink a cup of green tea (usually sencha) at night for the past few
centuries for its overall wellness related qualities. Fukamushi sencha
is very nice and mellow.

Rufus T. Firefly