Can a company require you to prove 90 days of CPAP usage even if you only need 20 days to get your CDL?

Question Details: For my job, I needed 20 days of CPAP usage to get a CDL to drive a truck, I was suspended until I got it. Now, after I have my CDL license, the company is requesting I show 90 days of CPAP usage of 4 hrs or more a night. I feel that this is being intrusive, because I have difficulty with the CPAP machine and don't use it but still get sleep. The company does not require anyone else to tell them how long they sleep at night. Also, if someone is taking medicine for diabetes or heart, proof that they are taking their pills. I was told I would be suspended again if I could not prove 70 usage for 90 days. Is this legal?

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