He may not sleep well
He may not sleep well during the first few weeks of this change. I know my partner didn’t. When you have a regular, office, salaried job, you sleep well. You know what the schedule is. You know you are allowed to not think about work for the 16 hours you’re away from it, so you sleep soundly. You know what’s to come the next day (or basically know), so you aren’t up wondering. That all goes away when you start from scratch.