We get lots of nights like that. I know this isn't really sleep advice but what I found most helpful is turning off the monitor. I think your routine is ok and he's getting a decent amount of sleep so it's really a matter of just going with it without worry. Keeping the monitor off (or out of the room I'm in) really helped me to relax and stop worrying about how long DD takes to go to sleep. I do check it about 30 mins after she goes to bed and then again after an hour so I have a general idea of when she went to sleep but not having it right in front of me keeps me from obsessing and thinking about what I should have done differently or how I can "make" her go to sleep. A wise BWer on here told me that, as parents, all we can do is offer the opportunity to sleep and it's up to the LO to take it or not.