三、概要补全。
Do you often have a sound sleep? How often do you wake up at night? Do you have difficulty falling asleep at night? If so, scientists may provide you with a good piece of advice—listen to some soft music.
Scientists have found that soft music can help to improve sleep quality. This works for sleepers of all ages, and even for those with sleeping problems. Soft music can help you fall asleep faster, wake up later and feel more relaxed all night.
There are two reasons why soft music can help you sleep better. It has real physical effects that can slow down your heart beats and the times you breathe during your sleep. It can also relax your mind and mood when you sleep. Both of them prepare a better sleep for you.
Scientists say that for most people, soft music makes a difference to your sleep more than other kinds of music. Whatever you listen
to, you should get the volume (音量) right, or the loud music will make you too excited to fall asleep. Also, remember a sudden stop of music will take away your good sleep at once. So make sure the final piece is gradually slowing down.
Any way, it's very important to get enough high-quality sleep. Before you go to bed tonight, play some soft music and get ready for your sweet dreams.

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1. who have sleeping problems
2. slowing down
3. helpful
4. that you can sleep well

1. 第一空：根据原文第一段内容，听轻音乐的建议是针对有睡眠问题的人群提出的，此处修饰先行词people，用定语从句说明该建议的适用人群，符合原文逻辑。
2. 第二空：根据原文第三段"It has real physical effects that can slow down your heart beats and the times you breathe during your sleep."，介词by后需要接动名词形式，因此填入对应形式。
3. 第三空：根据原文第四段"Scientists say that for most people, soft music makes a difference to your sleep more than other kinds of music."，可知轻音乐对大多数人的睡眠更有帮助，使用固定搭配be helpful for符合语境。
4. 第四空：根据原文第四段"Also, remember a sudden stop of music will take away your good sleep at once. So make sure the final piece is gradually slowing down."，选择平缓结束的音乐的目的是避免音乐突然中断破坏睡眠，保证优质睡眠，用so that引导目的状语从句符合原文逻辑。