Why do my LD's never start with reality checks?

I have been trying to LD for a few months now, and I'm starting to get the hang of it. I have had four in the span of the past few nights. However, none of these come from reality checks, or weird things happening in the dream. I'll just be standing somewhere, everything will seem perfectly normal, and I'll just think "I'm dreaming". Not that I'm complaining, but why is this?