Beta-agonists may make your heart race but in the majority of cases it really has little if no effect on the heart. Try Ventolin anyway to see if you are one of those susceptible to its cardiac properties. Remember the body gets used to it very quickley so effects may wear off.
Taking two puffs before u go to bed is one effective method but u may still wake up after 3 or 4 hours when it wears off. If that happens the best medication is slow release theophylline which opens the airways for up to 16 hours.