Question

if youve ever had a sleepless night, you know that a lack of sleep can make you feel sluggish. yet failing to get a good nights sleep can also have more serious consequences. sleep plays an important role in the process of learning new information. a lack of sleep reduces a persons ability to pay attention and concentrate, which makes learning more difficult. in addition, sleep is necessary for remembering information. in 2009, researchers discovered that brain patterns called sharp wave - ripple complexes consolidate memories—that is, fix them in the brain—and transfer them to long - term storage. these brain waves happen most often during the deepest phases of sleep. thus, you may have a hard time remembering what you learned during the day if you dont get enough sleep. what is the main, or central, idea of the passage? without enough sleep, a person may have a hard time learning and remembering information. sharp wave - ripple complexes, which often occur during deep sleep, are important for long - term storage of memories. failing to get enough sleep may cause a person to feel sluggish.

Explanation:

The passage first mentions how lack of sleep makes one sluggish, then focuses on its impact on learning (reducing attention - concentration) and memory (due to sharp wave - ripple complexes in deep sleep). The overall emphasis is on learning and remembering difficulties from lack of sleep.

Answer:

Without enough sleep, a person may have a hard time learning and remembering information.