I am so exhausted I can barely type this . It 's Thursday evening at 7:30 p.m. I was up again all night last night and I did n't sleep one wink . This is the second night this week I have n't slept any .

Question: Why have they barely slept ?
Answer: They had been having problems falling asleep .They had to stay up all night for school .None of the above choices .They had to stay up late for their job .