Mine would wake sometimes for short spurts and then at times not wake for days in NYC. They never slipped fully into brumation because the cage was kept warm and the ambient temps never really got cold---but the biological clocks are amazing on these animals and changes in environment--no matter how slight affect them.
Nico was brumating when I shipped him to me. He slept for weeks and weeks after--no matter how warm I made it---no matter what food I put out. I woke him a couple of times to see if he was alive and he was NOT happy about it. It was then I bought Rocco---his female counterpart. I made sure she was FULLY awake when I shipped her and it was totally different. He eventually woke up but it took an abnormal amount of time.
If your day cycles are changing (everyone's are) and your temps are cooling (ditto) then he's just doing whta comes naturally. Keeping the lights on is not a good idea.
Try and mimic the natural sunrise/set times (I actually run mine a little longer int he am) and he will be fine. Do not cut the light /heat off in an attempt to brumate him---he needs to have the consistancy of it when he wakes and attempts to bask.
The worst that can happen is that you miss him during this time
