Hello, Thanks for using healthcaremagic. Presence of sleep apnea is proxy indicator for many things including loose connective tissue in respiratory passage to obesity. It may also be caused by short neck. Other than that condition known as central sleep apnea can be caused by various neuro psychiatric disorders. You need to visit your doctor along with your husband to dentify the cause so it can be treated properly. Regarding license I feel till he gets trested he should abstain from driving as it is risky for him as well as common public. Hope my answer helps you. Thanks and regards