Asthma cannot be cured, but its symptoms are often controlled. Asthma is caused by inflammation of the airways. While there's no cure for asthma, there are variety of treatments which will help effectively control the condition.People with asthma often suffer from coughing at night time, wheezing and breathlessness that disturb their sleep. It is not clear whether there's a biological time factor liable for these nighttime disturbances or whether sleep in how contributes to them, but studies designed to uncover the precise influence of sleep or circadian rhythms on asthma are largely inconclusive