I think I learned a lot from the report of the third group. The film mentioned a lot of the effects of sleep deprivation, such as lack of enough sleep any new things we learn can't be recorded. It reminds me that I used to stay up all night reading before a test, and the next day I woke up, I found that I didn't remember it. The most important thing is that what they told us was all proven by experiments. He also taught us how to sleep better, it's really helpful.