The recall of dreams is extremely unreliable, though it is a skill that can be trained. Dreams can usually be recalled if a person is awakened while dreaming. Women tend to have more frequent dream recall than men. Dreams that are difficult to recall may be characterized by relatively little affect, and factors such as salience, arousal, and interference play a role in dream recall. Often, a dream may be recalled upon viewing or hearing a random trigger or stimulus.
Do animals have dreams ?
The ability to dream indeed seems to be embedded in the biology of many animals in addition to humans. Scientific research suggests that all mammals experience dreams. The range of REM can be seen across species: dolphins experience minimal REM, while humans are in the middle of the scale and the armadillo and the opossum (a marsupial) are among the most prolific dreamers, judging from their REM patterns.
Studies have observed dreaming in mammals such as monkeys, dogs, cats, rats, elephants, and shrews. There have also been signs of dreaming in birds and reptiles. Sleeping and dreaming are intertwined. Scientific research results regarding the function of dreaming in animals remain disputable; however, the function of sleeping in living organisms is increasingly clear. For example, recent sleep deprivation experiments conducted on rats and other animals have resulted in the deterioration of physiological functioning and actual tissue damage.
Some scientists argue that humans dream for the same reason other amniotes do. From a Darwinian perspective dreams would have to fulfill some kind of biological requirement, provide some benefit for natural selection to take place, or at least have no negative impact on fitness. In 2000 Antti Revonsuo, a professor at the University of Turku in Finland, claimed that centuries ago dreams would prepare humans for recognizing and avoiding danger by presenting a simulation of threatening events. The theory has therefore been called the threat-simulation theory.
According to Tsoukalas (2012) dreaming is related to the reactive patterns elicited by encounters with predators, a fact that is still evident in the control mechanisms of REM sleep (see below).
Other articles about interpretation of dreams
A standard traditional Chinese book on dream-interpretation is the Lofty Principles of Dream Interpretation compiled in the 16th century by Chen Shiyuan (particularly the "Inner Chapters" of that opus). Chinese thinkers also raised profound ideas about dream interpretation, such as the question of how we know we are dreaming and how we know we are awake. It is written in the Chuang-tzu: "Once Chuang Chou dreamed that he was a butterfly. He fluttered about happily, quite pleased with the state that he was in, and knew nothing about Chuang Chou.
1. We only dream of people we already know.
Our minds can not discover new faces. In our dreams we see real faces, real people that we have seen during our life but do not know or do not remember them. We have all seen hundreds of thousands of faces throughout our lives, so we have an endless supply of characters our brain to utilize during our dreams.
2. We forget 90% of our Dreams
Within five minutes after you wake up half of your dream is forgotten. Within 10 minutes you forget 90%.