It sounds to me like you are doing it exceptionally well. Probably very wise to decide on a plan for the night - then you don't have to think of anything when you are tired and half asleep.

Night light? Not everyone's cup of tea.
Doing a full sweep of his room with him (commando style) before getting in bed?
Radio on? (Again, not everyone's cup of tea, but it can distract from a scary noise)
Like PZ said, a special monster/boogey man spray?