Complete the text with the words in the box.
When I was little, I remember falling asleep as soon as my head hit the pillow most nights. I recall the comfort of hearing Mum and Dad talking downstairs and how the faint sound of their voices used to send me to sleep almost immediately. These days I find it a lot more difficult. To my mind, there is nothing more frustrating than lying in bed trying to sleep. Sometimes, I can't stop thinking about school and exams. I worry that I might have forgotten to do some homework for one of my subjects or some other trivial thing. I tried counting sheep once, but it didn't work. I ended up worrying about my Maths test the next day.