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Evolutionary Explanation of Sleep Description
Lifestyle factors - Aquatic vs terrestrial - Diurnal vs nocturnal - Predator or prey - Sleep site - Size
Evolutionary Explanation of Sleep Meddis (1975) Predator Prey Status THEORY
Sleep keeps vulnerable prey animals safe when normal activties impossible Diurnal can't forage at night, sleep evolved to keep safe from predators Amount of time animal sleeps depends...
Evolutionary Explanation of Sleep Webb (1982) Hibernation THEORY
Emphasises importance of energy conversation Animals hibernate to conserve energy when hunting and foraging are impossible Inactive during sleep
Evolutionary Explanation of Sleep Allison and Chicchetti (1976)
Prey animals sleep significantly less than predators oppose Meddis Basal Metabollic Rate positively correlated with sleeping timet supports Webb
Evolutionary Explanation of Sleep Lesku et al (2006)
Herbivores had less REM and total sleep time BMR negatively correlated with NREM and total sleep time
Evolutionary Explanation of Sleep Pilleri (1979)
Indus dolphins have evolved blindness, despite dangers from floating debris still have short naps 4-60 seconds 7 hours a day If sleep served adaptive function would have been...
Evolutionary Explanation of Sleep Alternative Explanation
Restoration Theory of Sleep Description
Sleep essential for restoring body and mind REM - Essential for brain restoration. People recovering from drug overdose spend most time in REM, newborns spend 1/3rd sleep in REM. Brain...
Restoration Theory of Sleep Shapiro (1981)
People who completed ultra marathon slept extra 1.5 hours 2 nights after race and stage 4 sleep took up greater proportion of total sleep time
Restoration Theory of Sleep Ryback and Lewis (1971)
Healthy volunteers who spent six weeks in bed had no change in their sleep patterns
Restoration Theory of Sleep Peter Tripp
Long term effects: - Divorced - Lost job - Drifted Short term effects: - Hallucinatiosn, spiders in shoes - Irrational behaviour - Psychotic - Altered state of conciousness
Restoration Theory of Sleep Alternative Explanation
Theories of Sleep Issues and Debates
Reductionist - Evolutionary NOT reductionist as it incorporates range of environmental factors, able to explain why different animals sleep in different ways. Restoration theory IS...