This is due to its cardiac
side effects which are seen at higher doses and more seen with home use
of nebulizers. Hence, one need to be careful with the dosage and should not exceed the recommended dosage.
The triggering factors like dust, fog, pollens etc. can cause the precipitation of these symptoms. You need to take measures to avoid exposure to such allergens. You can try sleeping with windows closed, which will avoid exposure to aero-allergen in the morning.