It’s hard not to resent Mondays. The day marks the end of the fun and freedom of the weekend—and that’s especially true during the summer, when ordinary Saturdays and Sundays have a carefree vacation vibe. Even if you love your job, the angst of having to go back to the grind on Monday can leave you disorganized and spinning your wheels all day, explains Richard Citrin, Ph.D., MBA, an organizational and consulting psychologist and author of “ The Resilience Advantage .” Then you have to spend the rest of the week playing catch up. But while Monday is going to happen whether you like it or not, that lack of productivity doesn’t have to. The key is to adopt a few smart habits on Sunday so you set yourself up for a brighter, more efficient workweek without really cutting into your weekend R&R time. These tips will help you do just that. Steal an Hour to Get Organized Whipping out the calendar app on your phone or tablet while you’re poolside or enjoying a sports ...