With more Americans working longer hours than ever before, many are choosing a tradeoff that may put their health at risk: less sleep.

The more money people make, the less they sleep, according to new research, The New York Times reports.

On average, adults earning the highest incomes — $98,000 for a family of four — sleep 40 minutes less than people in the lowest-income families, according to the government-sponsored American Time Use Survey.

Studies have consistently shown that sleeping less than six hours a night results in cognitive impairment, as increased risk for heart disease, mental-health problems, and other issues.

But the latest research shows many Americans are choosing to sleep less because they are working more hours. In fact, people who work two jobs sleep the least of anyone.