Hi Nathan's mommy. We went through this as well right about the 8-9 month mark, and so we (my dh, mom, and nanny) made a house rule. DS is in his room for a minimum of an hour, without interference. So that means, when he wakes at 45 mins, we leave him in there. We don't do a thing. We had found that our interference just made the process harder. He sometimes took our visits as play time. After a few days of doing this, he learned to resettle and would often fall back asleep unassisted. My two cents, leave him be. Like everything else, it's probably temporary!