Re-energizing your mind and body can be done in several ways. Caffeine can accomplish the task but the seemingly beneficial effects comes with its downsides like elevating your stress hormones. An alternative way is meditation which has no adverse effects since no chemicals are involved.
I found this post by Carole Fogarty which cites several ways to re-energize and calm the mind using mudras. Below is an excerpt:
"Mudras are hand postures that when held for as little as three minutes can encourage the flow of specific energy channels in your body. They are very subtle and allow the body when given the chance to re-balance itself." .... read the rest
Believe me it works. It's better than caffeine in giving you a lift.
Meditation Can Give You a Lift
Caffeine and Meditation