覚かく醒せい周しゅう期き

noun

sleep-wake cycle

Technical term in sleep science and chronobiology; refers to the daily alternation between sleep and wakefulness.

• 覚かく醒せい周しゅう期きが乱みだれると、日にっ中ちゅうの眠ねむ気けが強つよくなる。

  When the sleep-wake cycle is disrupted, daytime sleepiness increases.

• 光ひかりは覚かく醒せい周しゅう期きを調ちょう節せつする重じゅう要ような要よう素そだ。

  Light is an important factor that regulates the sleep-wake cycle.