Hello, Yes, Asthalin can cause side effects like: headache, rapid heart beat, tremor, muscle cramps, trouble sleeping, nausea, diarrhea, dizziness. Your difficulties with sleeping and uncomfortable using can be cause by Asthalin. You should contact Your doctor so that he or she can check You and find the reason of Your cough and prescribe adequate treatment. The most common cause of cough is viral respiratory track infection, asthma and gastroesophageal reflux disease. Hope I have answered your query. If you have any further questions I will be happy to help.