I've noticed some positive changes in my work efficiency that seem to have happened after I took a more serious attitude to paying attention to my thought processes, writing things down, and systematically approaching tasks:

Though do take this anecdotal evidence with a grain of salt, as the below relates to a high school career (from 10th to 11th grade. I suspect you might not be able to get as effective gains if you're in a higher level environment like university or a technical career)

• I've been going to bed earlier this year, despite having a heavier workload in school (around 1 hour earlier, on average, from 10:30 to 9:30).
• I've managed to maintain approximately the same grades while doing so, and I'm managing to work in more time to read books (~30 min day) and now exercise every two days (~50 min), and end all computer usage after 7:00, phones and tablets included, all habits I didn't consciously form last year when I hadn't paid much attention to how I thought about things and used time.