Definitely more power to you. Every week, I try to trick my body into waking up at 6am (let alone being at the office at the same time), but my biological clock always finds a way to reject attempts at realignment in short order.

On the flip side, being an early bird on an 8-hour schedule is a non-issue with my current employer. In fact, 5:45am-2:15pm was clockwork for a certain graybeard engineer; if you couldn't schedule and conclude your business with him within those hours, you were simply out of luck, and any manager with a clue of who really transforms shit into green leaves in our branch would be seriously hardpressed to upset this balance.