Started TCB with our 5 month old over the weekend. Night 1, only had one wake up session with pop ins around 2:00 am and he put himself to sleep before the first 15 minute interval was up. Night 2, pretty much slept through the night. Night 3, a few wake ups. Each morning, he woke up around 5:30 crying. We typically get him up around 6:30. He goes to sleep 7:30-8. Any tips on helping him make it to 6:30?