What are the two kinds of sleep we experience every night Every night we have two kinds of sleep: active sleep and
举一反三
- Two groups of people are compared in the third study. They are people______. A: with less than5 hours of sleep a night and with 7 to 9 hours of sleep B: who slept 4 hours a night and who slept 4 hours for 2 nights C: with less than 4 hours of sleep a night and with 7 to 9 hours of sleep D: with less than 5 hours of sleep a night and with 8 hours of sleep
- Few things are as_________as getting a good night’s sleep every night.
- 青书学堂: (单选题) Research findings show we spend about two hours dreaming every night, no matter what we ( ) have done during the day.
- 中国大学MOOC: I have to set numerous alarms for the morning because I sleep like a _______ every night!
- How many hours do you need to sleep every night according to the video?