So he came home tonight before his night shift. He put the kids to bed, they were delighted. He didn't say a single thing to me until he left for work. (And even that was just to lock the door behind him). I didn't try to engage him or speak to him. I just carried on doing what I was doing. (It wasn't much, just relaxing on the sofa watching tv). Is that the right thing to do? It feels very strange, it's do uncomfortable.