Hedgehog
The hedgehog has elevated sleep to an art form bordering on the transcendent. During hibernation, its heart rate drops from 190 to merely 20 beats per minute, body temperature falls to near-ambient levels, and the creature enters a state of metabolic suspension lasting up to six months. Even during active seasons, the hedgehog sleeps approximately 18 hours daily, emerging only when darkness provides cover for its foraging expeditions. This represents a 75% sleep efficiency rate, a figure that would make any human weep with envy.
Astronaut
Astronauts aboard the International Space Station experience 16 sunrises and sunsets daily, catastrophically disrupting circadian rhythms. They sleep in cupboard-sized compartments, strapped to walls to prevent floating about and disturbing colleagues. Average sleep duration is six hours, with quality notably degraded by noise, microgravity disorientation, and the ever-present awareness that only a few centimetres of aluminium separate them from the void. Sleep studies reveal that most astronauts are chronically sleep-deprived throughout their missions.
VERDICT
The hedgehog's mastery of restorative unconsciousness is beyond reproach. Whilst astronauts battle to achieve even modest rest in their orbital insomnia chambers, the hedgehog slumbers with the peaceful abandon of a creature that has absolutely no deadlines.