hmm...odd because I'm pretty sure I read one of the side effects of sleep apnea is anxiety, but you're describing the opposite (anxiety should be resolved with CPAP, if that were the primary cause). my only thought is perhaps now that you're sleeping properly, now you have more energy than you have ...

awe man this just started happening to me after about 8-10 years of CPAP with nasal pillows. using the F&P SleepSyle machine and F&P Eson 2 mask which has a diffuser with a pop-off filter on it. Going to try an experiment tonight and remove the filter to allow slightly more air flow exiting the mask...