Do you have a dream-journal? Even if nothing unusual happens, there can still be dreamsigns, like a small girl walking up to you, asking you stuff. Or maybe, you often see pink cars in your dreams? Not abnormal, but still a bit weird. Start a dream-journal, max out your recall, then read through it and mark all the dream-signs. Since your dreams are normal, you should also experience your dream-signs during the day, so everytime they happen, do a reality-check.