Slumber Party: Reptiles, Like Us, Have REM Sleep and May Dream (Scientific American)
"Research in a German laboratory involving five lizards called Australian bearded dragons indicates that these reptiles may dream and could prompt a fundamental reassessment of the evolution of sleep."
What Do Animals Dream About? (BBC)
"We certainly can't ask animals if they dream, but we can at least observe the evidence that they might. There are two ways in which scientists have gone about this seemingly impossible task. One is to look at their physical behaviour during the various phases of the sleep cycle."
Does Everyone Dream? (Discover Magazine)
"In questionnaire surveys, up to 6.5% of people report that they 'never dream'. Although most of these people report having dreamed at some point in the past, roughly 1 in every 250 people say that they can't remember ever dreaming - not even once."