- Energy Conservation
- Warm blooded animals need to expend a lot of energy to maintain a constant body temperature.
- Particularly problemativ with small animals.
- All activities use energy, animals with high metabolic rates use even more.
- Sleep, provides a periof of enforced inactivity; hibernation.
- Foraging Requirements
- The time spent sleeping may be constrained by food requirements.
- Herbivores spend their time eating plant which are poor in nutrients.
- Must spend a great deal of time eating and not much sleeping.
- Carnivores can afford to sleep.
- Predator Avoidance
- Sleep is constrained by predation risk.
- Predator can sleep for longer; prey have to be vigilant for predators.
- Waste of Time
- Meddis proposed the waste of time hypothesis. Sleep helps animals stay out of the way of predators during the day.
- Sleeping furing the hours of darkness. and where they will be hidden.
- Sleep may ensure that animals stay still when they have nothing better to do with their time.
- Siegel says being awake is riskier than sleeping.
- Only possible explanations for sleep is that it enables both energy conservation and keeping an individual out of danger
- Energy, foraging…
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