What Did Researchers Discover About the Relationship Between Sleep Efficiency

Multiple Choice

What did researchers discover about the relationship between sleep efficiency and longevity?

A) there was no relationship between sleep efficiency and longevity.
B) the most important factor was the time at which people went to bed.
C) people who spent the highest percentage of bedtime asleep lived the longest.
D) those individuals who spent the highest percentage of bedtime asleep experienced higher rates of obesity.