9. Written informed consent obtained. Inclusion criteria required following run-in: Subject has used rescue medication for at least 3 days & had at least 1 night with sleep disturbance (i.e., sleep disturbance score of ≥ 1) during the last 7 days of the run in period,OR subject has used rescue medication for at least 3 days & had at least 3 days with asthma symptoms (i.e., a symptom score of ≥ 1) during the last 7 days of the run-in period.