But this whole concept of recharging energy sounds pretty unscientific to start with, unless you're talking about sleep and digestion. Although interestingly I

But this whole concept of recharging energy sounds pretty unscientific to start with, unless you're talking about sleep and digestion. Although interestingly I did see an experiment once that showed introverted people salivated significantly more than extroverted people, while carrying out a group task (licking envelopes).