Airlines should consider restricting access to alcohol on long haul flights to protect the heart health of their passengers, academics have said. Many holiday goers will celebrate jetting off on their travels with an alcoholic beverage and some of these may have a doze on a plane. But a small study has found that the combination of in-flight alcohol and cabin pressure at cruising altitude may put strain on sleeping passengers’ hearts. The combination appears to lower blood oxygen and increase heart rate, even among younger adults. “The on board consumption of alcohol is an underestimated healt…