What is one possible impact of decreased sleep efficiency?

Decreased sleep efficiency refers to a reduction in the proportion of time spent asleep while in bed, which can lead to longer periods of wakefulness during the night. When sleep efficiency is compromised, individuals often experience increased total wake time, meaning they spend a larger percentage of the night awake and not in the restorative sleep stages. This extended wakefulness can stem from various factors, including sleep disturbances, anxiety, or discomfort, ultimately impacting overall sleep quality.

The other potential impacts, such as less wake time during the night, better alertness, or more rapid onset of sleep, do not align with the concept of decreased sleep efficiency. Instead, these factors suggest improved sleep quality, which is contrary to what happens when sleep efficiency declines. Therefore, recognizing that increased total wake time is a direct consequence of lowered sleep efficiency is crucial for understanding its significance in sleep studies and treatments.