The allure of an in-flight nap, enhanced by a glass of wine, may seem like a perfect solution to long-haul travel fatigue. However, new research indicates that this common practice could be more detrimental than beneficial. Airplane cabins are pressurized to simulate an altitude of 8,000 feet, where air pressure and oxygen levels are significantly lower than at sea level. This environment, combined with alcohol consumption and sleep, can lead to a more pronounced decrease in blood oxygen saturation, according to a study published in the journal Thorax.

Dr. Eva-Maria Elmenhorst, lead study author and deputy of the department of sleep and human factors at the DLR Institute of Aerospace Medicine in Cologne, Germany, advises against alcohol consumption during flights. The study involved recreating the atmospheric conditions of a flying airplane cabin and observed 48 healthy adults over two nights. Participants slept for four hours in two scenarios: once sober and once after consuming alcohol equivalent to two glasses of wine or cans of beer. The results showed that alcohol led to reduced oxygen levels and increased heart rates.

Cardiologist Dr. Andrew Freeman, who was not part of the study, suggests that while the study is small, it serves as a foundation for further investigation into the effects of alcohol, sleep, and flight on health. He warns that alcohol can negatively impact both the quality and quantity of sleep, leading to more fragmented rest and potentially exacerbating symptoms for those with cardiac or pulmonary diseases.

The study also highlighted that alcohol consumption before sleep under simulated flight conditions reduced REM sleep, a critical phase for memory consolidation and brain recovery. Dr. Shalini Paruthi, an American Academy of Sleep Medicine spokesperson, notes that alcohol can lead to more frequent waking during the night and less overall sleep.

Experts recommend staying hydrated, avoiding heavy meals, and getting some exercise during flights to improve sleep quality. They also advise against mixing sleep aids with alcohol, as both are depressants and can intensify their sedative effects. Instead of relying on alcohol to induce sleep, travelers should try to align their flights with their natural sleep patterns and maintain a consistent sleep routine.

In conclusion, while a glass of wine might seem like a harmless aid to an in-flight nap, the potential health risks it poses, both immediately and in the long term, make it a practice best avoided. Maintaining healthy habits during air travel can contribute to a more refreshing and enjoyable journey.