noun
sleep-wake cycle
Technical term in sleep science and chronobiology; refers to the daily alternation between sleep and wakefulness.
覚醒周期が乱れると、日中の眠気が強くなる。
When the sleep-wake cycle is disrupted, daytime sleepiness increases.
光は覚醒周期を調節する重要な要素だ。
Light is an important factor that regulates the sleep-wake cycle.
Compound of 覚醒 (かくせい, 'awakening') and 周期 (しゅうき, 'cycle'). A modern technical term with no known historical derivation issues.