what problem can insufficient sleep cause in students?insuff

what problem can insufficient sleep cause in students?insuff what problem does the large population cause? What problem will p______lwith fire cause? What is the cause of World War One (Can you answer in Englis what problems can this difference cause? What health problems can junk food cause? In fact,_______ one cause that leads to the problem. the problem is (what we can do/deal with problem) 39206: these can also cause an inability to sleep at some ti I can do that in my sleep This math problem is so difficult that only ( ) students can Few students can understand this problem until it-----twice