[Answer] Most people are awake during the day and asleep at night because their ________ cycles are aligned with the outside world.

Answer: circadian
Most people are awake during the day and asleep at night because their ________ cycles are aligned with the outside world.
Circadian rhythm sleep disorders (CRSD) also known as circadian rhythm sleep-wake disorders (CRSWD) are a family of sleep disorders which affect the timing of sleep. CRSDs arise from a persistent pattern of sleep/wake disturbances that can be caused either by dysfunction in one’s biological clock system or by misalignment between one’s endogenous oscillator and externally imposed cues.
A circadian rhythm is a natural internal process that regulates the sleep–wake cycle and repeats on each rotation of the Earth roughly every 24 hours. It can refer to any biological process that displays an endogenous entrainable oscillation of about 24 hours. These 24-hour rhythms are driven by a circadian clock and they have been widely observed in plants animals fungi and cyanobacteria.
Sleep is a naturally recurring state of mind and body characterized by altered consciousness relatively inhibited sensory activity reduced muscle activity and inhibition …

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