Perhaps a decent alternative?
L-Tyrosine in the morning helps many w/the wake up and lack of energy. Per the Thomas guide to Opiate withdrawal, start w/2000mg in the morning on an empty stomach, don't eat for an hour. Gives a natural burst of energy, last throughout the day. You come down in the evening and are able to sleep. Doesn't work for everyone, but many swear by it. Get it at any GNC, healthfood store -- worth giving a shot.