LB: Good point about internal/external!
LU: You’re welcome! Chocolate does have caffeine (and the stimulant theobromine), so I personally would never eat it at night, but if you’re a coffee drinker you might be used to so much caffeine that the amount in a little chocolate wouldn’t disrupt sleep.
The funny thing is that men should eat a lot of chocolate too (as I’m sure many do), since men are at higher risk of a heart attack, which chocolate seems to help prevent.