First., I've been unable to sleep because of the stress that I have an exam in 2. Could not sleep because I have problems with my health is always a regular bedtime.
1. I have insomnia because it caused me stress in examination matters 2. insomnia because I have a health problem is I usually cough regularly before bed.
1. I can't sleep because I had caused by the tension in the story, I have exam 2. I can't sleep because there is a problem with health care is, I am often the routine before bed