A new survey commissioned by the trade union Impact shows that the rate of ill-heath among cabin crew members is "extraordinarily high".
The Health and Wellbeing report by Dr Richard Wynne of the Work Research Centre, took place in July 2014 and examined health indicators among Aer Lingus cabin crew based in Dublin, Shannon and Cork.
The study also compared the results to a survey carried out in 1995.
Michael Landers from IMPACT said many crew members suffered from sleep disruption and digestive disorders.
He said: "The rates of ill-health among cabin crew were extraordinarily high, particularly their level of psychological well being was very low."
He added crew showed a well above average rate of digestive disorders and tremendous problems with sleep disruption to the point that a full one third of cabin crew were relying on sleep medication at least once a week".
He said the situation arose because of the "very disruptive rosters they work".