If you're looking to improve work-life balance in the new year, there are loads of options. However, before you propose a flexible work arrangement, develop a clear picture in your mind of what you want and how you plan to sustain productivity and your usual high performance.
When you propose flex time to your employer, don't focus solely on yourself and your needs. Avoid using the words "I" and "me." Persuade your boss that the new plan is in his best interest and that you've fully considered how it will work for him. "We" is the term to use as you have these discussions. Employers won't care so much about why you want to do this. They want to know how you plan to maximize your time. The most important question to keep in mind as you develop your strategy is: How will it benefit the company?