PSY 4127 Chapter Notes - Chapter 1: Sleep Paralysis, Rapid Eye Movement Sleep, Marsupial
4 Jun 2018
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Chapter 1: The Evolution of Sleep
• one approach to revealing the purpose of sleep would be to trace its evolution
• by identifying the type of animal in which sleep first appeared, we might identify the
initial train that caused a need for and benefitted from sleep
• by tracing subsequent evolution of sleep, we can determine if additional sleep functions
evolve secondary in conjunction with the evolution of new types of animals with new
biological needs that could be fulfilled most effectively or exclusively during sleep
• it is assumed that animals today sleep in the same manner as their ancestors
Unhemispheric sleep in marine mammals undoubtedly influenced the formation of
functional theories that posit a local role for sleep in synaptic maintenance of the neocortex.
What is sleep: behavioural state distinguishable from wakefulness by reduced responsiveness
to stimulation.
• distinct changes in brain activity
• following sleep deprication, animals sen more time sleeping and sleep more deeply
Mammalian Sleep
• two distinct states: REM and non-REM
Non REM sleep is characterized by low frequency, high voltage EEG activity. EEG slow
waves reflect the bistable nature of the neocortical neuronal membrane potentials during
non-REM sleep.
Given the simulations occurrence of EEG activation during an unresponsive sleep paralysis
EEG has also been labeled paradoxical sleep.
Non-REM and REM sleep have been recorded in all placental and marsupial species
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