It was odd.
Dream Force was meant to be one of the most dangerous Forces in all of existence. As the arbiter of consciousness, having it in too large a supply was always a bad thing as those who didn't have high affinity for it would find the line between fiction and reality blurred, a lot like what a schizophrenic would experience.
Dream Force carried with it the power of perception and fundamentally, perception was often reality.
If someone had a dream about being invincible, they would wake up and this feeling would be gone. In addition, they would then be able to pick out all the oddities in the dream that should have made it obvious to them that it was one.
However, if the Dream Force was cranked up, suddenly the line wouldn't be so obvious. The dream would become too real, too tangible. Then, you'd suddenly have a person jumping out of a building as a mere mortal in the real world because they got it in their heads that they were invincible.
