I'm trying to remember where I heard the term 'decision fatigue'. I believe it was in the book The Power of Habit by Charles Duhigg. It's a great book that I highly recommend. The point though is that I realy love that phrase, decision fatigue. It resonated with me so much the first time I came across it. If I remember correctly, the point the bookmakes with this term is that habits allow us to prevent decision fatigue. By having things we do routinely, without thinking, it lets us save all that decision making energy for other problmems.
I frequently find myself exausted from making decisions. When I work weekends, my husband handles dinner. He will sometimes ask if there is anything special I want. I usually answer something along the lines of, "I want to not have to think about it." Then he gets takeout and we are all happy.
When I was recovering from my many surgeries, I had a lot of anxiety about a lot of things. I didn't feel I was coping all that well, and I was supposed to be carefully watching my weight and following so many other instrutions I wa getting overwhelmed. I took advantage of a program my insurance provided to do phone coaching for things like weight, stress management, etc. Some of the problems I discussed with my councler/coach person were very small everyday things, like the stress of figuring out what to do for dinner all the time. She helped me come up with a system to plan ahead weekly so I knew what I needed to do each day. It seems so simple, but at the time I just couldn't make any more decisions. I was seriously fatigued. Even better, small things like this really helped. Way more than I expected them to. To have a plan for everyday things leaves what little decision making energy I have availble for decisions that come up that can't be planned for.