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Hypothetical determinants of sleep.
| Factor | Promotes (↑) or suppresses (↓) sleep |
|---|---|
| Ecological | |
| Protection against predation | ↓ |
| Enhanced mating success | ↓ |
| Incompatibility with swimming | ↓ |
| Thermoregulation | ↓ |
| Need to forage for food | ↓ |
| Adaptive inactivity | ↑ |
| Intrinsic | |
| Enhancement of memory consolidation | ↑ |
| Complementation/compensation for NREM | ↑ |
| Activity-dependent rewiring of CNS | ↑ |
| Energy conservation | ↑ |
| Metabolic clearance | ↑ |
| Sensorimotor tuning | ↑ |
| Synaptic homeostasis | ↑ |
