阅读下面一篇短文，从短文后的选项中选出能填入空白处的最佳选项。选项中有一个为多余选项。

Do you have difficulty falling asleep at night? If so, here is a piece of advice for you: Listen to some soft music.

Scientists have found that soft music can help to improve sleep quality and quantity. It works for people of all ages. ____（1）____ Soft music can help us fall asleep faster, wake up less during the night and feel more rested in the morning. You may not notice the effects overnight, though. It could take as many as three weeks to see any improvements.

____（2）____ The reasons aren’t clear yet. It may have something to do with the relaxing effect of a good song. Music can have real physical effects, too. Soft music can lower our heart rate and slow down our breathing. ____（3）____

Scientists say that for most people, music that has 70 beats per minute (bpm) works best. Classical, jazz and folk music are usually more effective than other musical styles. ____（4）____ You may need to experiment(尝试) to make your own playlists. If you are not sure how many beats a song has in a minute, you can find out by entering its title into songbpm.com. And remember to get the volume right. Make sure that the final piece is one that slowly fades out(渐弱). ____（5）____

It is very important to get enough high-quality sleep. Before you go to bed tonight, play some soft music. Then, just prepare to be rocked off to dreamland!

A．	This prepares us for sleep.
B．	Familiar songs work well, too.
C．	Scientists like different kinds of music.
D．	Why can soft music help us sleep better?
E．	If not, you may be woken up by the sudden silence.
F．	And it works much better for people with sleeping problems.