CPAP treatment is used only when sleeping and needs to be used EVERY time someone with OSA sleeps. The user will experience almost immediate relief of symptoms with this form of treatment. However it is a treatment and not a cure, if the treatment is stopped the airway will continue to collapse.
CPAPs are portable, lightweight and can be used at home or while on vacation. The pressure range for most CPAP machines is 4-20 cmH20 and the pressure that you require will be determined in the sleep lab during a sleep study.