From my own experience - he was probably getting up later, going to work later, and getting home a while after her, which is where the real 'time together' was

From my own experience - he was probably getting up later, going to work later, and getting home a while after her, which is where the real 'time together' was gained (him leaving work earlier). Also a lot of people like to be winding down and going to bed together, which doesn't work if one of you is going to be up for another four hours.