I wish I knew the answer to this. I don't think it is just a personality issue. In my 20s, I pursued my goals with extreme determination: career, education, financial targets, and creative projects. I chose work and getting things done over sleep. 7 years ago that stopped. I am not sure why. I burnt out career-wise and my mind seemed to deaden with regard to creative endeavors. Why? Or more importantly, how can I get back to the way I was?

Future time orientation is very important when it comes to achieving goals. Being able to resist the urge to enjoy short term pleasures in favor of reaching long term targets.