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 .
Why have they barely slept ?
Pick the best answer from the following options:
- 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 .


They had been having problems falling asleep .