Final answer:
Without access to the specific study from Nature and Science of Sleep, we cannot provide the exact percentage of college students who complained of insufficient sleep. However, related literature does support that a significant number of college students experience sleep disturbances and insomnia.
Step-by-step explanation:
The question regarding the percentage of college students who complained of insufficient sleep in a study published in Nature and Science of Sleep does not provide a specific answer within the provided reference material. Therefore, without the specific data from the mentioned study, we cannot assert whether the correct answer is 20%, 40%, 70%, or 95%. However, separate studies referenced do indicate that many college students struggle with sleep issues, with a significant portion of the student population experiencing sleep disturbances at some point in their lives.
While we don't have the exact figure requested, it is commonly understood, as supported by the literature, that college students are a demographic particularly prone to sleep problems. This could be due to stress, overwhelming academic requirements, or other lifestyle factors. It is important for students who experience persistent sleep difficulties to seek professional advice, as chronic insomnia can have a significant negative impact on well-being and academic performance.