Kids' Sleep Connnected to Marital Stress

This seems a little silly to me, but I would love to know what you think. Is it possible that the reason your baby isn't sleeping is because your marriage is having problems? It sounds far-fetched to me. I guess if and your spouse are up screaming at each other and waking up the baby it would be a factor. Or maybe you're not as patient as you need to be because you are stressed out about your marriage? I don't know. It seems like a stretch. I am no scientific researcher, but I don't know that I buy this one.
FROM NBC: New research reveals marital problems can create sleep problems in very young children. A study of 350 families found that marriage instability when children were only nine months old, predicted difficulty falling asleep and staying asleep by the time they were 18 months old.
The children in the study were all adopted, so shared genes were not a factor. Researchers say their findings show marital stress affects children much earlier in their development than previously thought. They say parents should be aware their behavior can affect the well being of their children -- even in the first several years of their life.