A night example

This is the film of a full night taken with a firewire iSight placed at 3 meters from bed, with a snapshot taken all 2 minutes. The real bed time was actually 11:40 pm, but the first snapshot time has been delayed by one hour in order to forget about the computer. Once asleep, the light is not even noticed by the sleeper.
The resulting profile as it appear in Dream Recorder is shown below: spotlights areas are dream periods. Blue shading zone indicate normal sleep.

You may notice that a dream feedback (moon icon) has been emmited around 3:10 am, in the predefined time window, where the motion of the sleeper was particularilly important. It is followed by a voice recording of the dream.