Some more conservative dream theorists postulate that dreams are merely a result of excess sensory input "left over" from the previous day. This idea may explain why some dreams are extremely realistic in ever way, and sometimes leave you guessing as to what really happened and what did not. This might be a viable explanation if your daydreams are realistic in nature. Conversely, if your daydreams are more fantastic and abstract, but are combining with real day-to-day situations on a continual basis, then there may be a cause for alarm because that is a form of psychosis. Personally, I've had many dreams, like the first example, that seeped into the next morning and left me wondering if they really happened. It's definitely confusing, but somewhat entertaining when I figured things out.