Is reality real? Season 4, Episode 8 investigate reality, and whether or not our reality is real? at the last 10 minutes of this episode, they talk about dream within dream. We spend 8 hours sleeping and 16 hours awake. During the 8h sleep 20 percent are spent in REM. The question is are we living in the real world or we are living a dream without even noticing that! hmmmm interesting!