I am so tired , but I ca n't seem to tear myself away from the computer to go to sleep . All day I was dreaming of coming home and watching the last two episodes of Dr. Who . I know it 's a two - parter , so it will take about 2 1/2 hours to finish . Of course life does n't always go according to plan .
According to the above context, choose the best option to answer the following question.
Question: What may be the reason for their sleeping problems ?
Options:
- None of the above choices .
 - They stay up too late watch TV shows .
 - They stay up too late watching television .
 - They spend too much time on the computer .


They spend too much time on the computer .