Sleepy,
This is not only a reality check but a clear sign you are infact in a dream. This is known as the Transparent Eyelids Effect and happens to many people when attempting to Wild. I get this nearly every time I actively attempt to wild. I am laying there with my eyes closed, when suddenly I realize I am looking at the ceiling, or around the room... I jump up and run around doing my usual lucid stuff.. In your case, you will want to do an additional reality check to confirm after you get up.. but this is not only a reality check, it is lucidity.. I am always lucid after I experience the transparent eyelids. Hope this helps