Why did the writer sleep on a couch?

Read the following text and then answer the questions!

    Last Thursday was my day off. I didn't go anywhere. I just stayed at home for two weeks to do the same activities routinely, over and over again. I felt that it was the worst day I had ever passed.

    I woke up earlier and did Subuh prayer. After that, I had breakfast with my family in the morning. At 08.00 a.m., I turned on computer and played many games. Soon after, it was 10.00 o'clock. I rushed to take a bath to freshen my body.

    Then, I watched my favorite TV programs until it lasted almost midday. At 01.00 p.m., I went to bathroom to and immediately did Zuhur prayer. Then, I had lunch and helped my mother to clean the house. Because I was tired, I fell asleep on the couch. Unexpectedly, after waking up I had a guest who could cheer me up. My aunt came with her children. I kept playing with my nieces until night. Although just a home holiday, it could at least refresh my mind from the routine activities in the office.

Why did the writer sleep on a couch?