If one of your employees has a sleep disorder, it’s best to address it, reports The HR Digest.

When an employee is found sleeping on the job, it is the manager’s duty to ascertain the reason for the fatigue. Is it because of late-night partying or moonlighting? Is she suffering from a sleep disorder such as narcolepsy or sleep apnea? Is she prescribed to drugs or a medical procedure that leaves her exhausted? Is she suffering from work-related stress that makes it hard to sleep at night?

“I didn’t realize I had a problem until my manager practically pushed me to check if it could be a serious condition. Turns out, I’m not lazy…or high, as my co-workers think… I suffer from narcolepsy,” says Mathew, a social worker from Seattle.