I've been lifting weights most of my life. I typically get up early in the morning to lift. I'm finding it very hard to get motivated to wake up at 4:45 AM to work out before work. I'm busy all day, and that leaves a time frame starting at 7:30 to 8:00 PM to lift weights. I typically hit the sack about 9:30 to 10 PM. I've heard that lifting this late at night boosts your metabolism and makes it hard to go to sleep. This would not be a good thing since I have to wake up fairly early to get to work anyway. Let me know if this is true and if you lift late at night please let me know how it works for you.