Goal: Wake up early to exercise before go to work

I must confess I am not a morning person.  I hate waking up early – whether it’s weekday or weekend.  However, my goal is to wake up early in the morning to exercise before heading to work.  So far I’ve been doing it for a couple weeks.  It seems I have more energy and more productive than before.  Of course, I also need a good night sleep and eat healthy.  The issue is having energy to be active and to concentrate.  As the cold weather begins to arrive, I am not sure if this goal will last.  I am hoping that I am able to sustain during the cold weather.