Chapter 7 of 10All chapters
Chapter 7 of 10
Sleep and energy
Maintenance is not optional.
What sleep does
Memory consolidation, clearance of metabolic waste and synaptic housekeeping all occur during sleep. Deprivation degrades attention, judgement and mood measurably.
- The brain is highly active during sleep, not switched off.
- Chronic short sleep produces impairment people stop noticing in themselves.
Energy use
Around 20 percent of the body's energy for 2 percent of its weight, most of it spent on baseline activity rather than on thinking hard.