I was exhausted the first few months. Like Dee said, I don't think I could have managed 40 hours a week and a family. I had naps nearly every day and at 8.5 months, still do most days.
It takes a lot of energy for your brain and body to heal.
Don't know if you've read the PAWS article, but it has a lot of good information and also explains part of why we get so tired easily. Not only are we healing, but we're now thinking about so many new things when it used to be all we cared about was our next drink.
Why We Don’t Get Better Immediately: Post-acute Withdrawal Syndrome (PAWS) | What...Me Sober?
It does get better with time. Be patient with yourself.