So having him develop a really solid bedtime routine that he does might make it easier to replicate that in the middle of the night to get them both back to sleep ASAP. (askmoxie.org)
We have a very solid bedtime routine every night, we read 7 - 10 board books and then sing Piano Man (I know, not suited for kids but it was the only song my husband and I both knew the lyrics to at the time) and we put them down awake so they can settle themselves. (babybunching.com)
I've struggled with insomnia a fair amount but paying attention to my stress level and having a solid bedtime routine has helped a lot. (golubkakitchen.com)