Caffiene Nation

I had an interesting conversation with the lady who is conducting a training session I've been in since yesterday. She's American, although that really has very little to do with it, and early in the session she mentioned that every night at around 11:00 pm she brews a pot of coffee (apparently strong enough to float a horseshoe) and drinks it before she goes to bed. Then later in the day, as part of a different conversation she mentioned that she suffered from insomnia for 2 years until she started taking medication to help her sleep.

Does anyone else see the connection? Apparently she doesn't.