I just decided to do this yesterday and I am so much more relaxed.
Work has gone crazy for me recently. I have developed the habit over my career of working my butt off to accomplish as much as humanly possible. It took 3-4 people to replace me at my last job.
The workload here has skyrocketed. My personal life is miserable and I'm just so stressed over everything.
I made the conscious decision to just do what I can to get my work done, and be ok with it if not everything gets done. I'm the only one setting this unrealistic standard for myself. I don't have to kill myself to do it....and I'm starting to relax and feel just a bit better.
Edit: I grew up and entered the working world under the understanding that if worked hard I would be rewarded. And looking back on everything, that has never actually happened. The only thing that did happen was I was taken advantage of. I had people in my early employment years try to convince me to do their work for them on the side. I was denied raises and underpaid. At my last job I was 100% convinced I was being underpaid. I gave them advanced notice I had received an offer I was taking seriously. I handed in my two weeks notice and they stonewalled me up until the last day. Then the VP pulled me into his office, told me they couldn't lose me and offered me a massive raise.
I asked about the problems with the company that lead me to quit that I knew they knew about and asked them why they hadn't fixed any of it yet. Didn't get a good answer. So I told them no and left.
Proudest day of my career so far. I'd always been so nervous about authority but just knowing they needed me and I didn't need them gave me such a confidence boost it was amazing.