During sleep, most systems in an animal are in an anabolic state, building up the immune, nervous, skeletal, and muscular systems. Sleep in non-human animals is observed in mammals, birds, reptiles, amphibians, and fish, and, in some form, in insects and even in simpler animals such as nematodes. The internal circadian clock promotes sleep daily at night in diurnal species (such as humans) and in the day in nocturnal organisms (such as rodents).
tyrannical - characteristic of an absolute ruler or absolute rule; having absolute sovereignty; an authoritarian regime; autocratic government; despotic rulers; a dictatorial rule that lasted for the duration of the war; a tyrannical government. authoritarian, tyrannic, autocratic, despotic, dictatorial.
(plural tyrannies of the majority or tyrannies of majorities) (politics) A situation in which a government or other authority democratically supported by a majority of its subjects makes policies or takes actions benefiting that majority, without regard for the rights or welfare of the rest of its subjects.