Hello, Insomnia, either primary (without any other identifiable cause) or secondary (in background of some other cause like depression, medication, etc) is common at his age, and more specifically in context of cardiac disease. The medication for him should only be decided after a thorough medical, cardiac, and psychiatric assessment. Prescription without due assessment can be rather detrimental to his overall health. Hence my suggestion for you is that please seek a consultation with a psychiatrist near you for comprehensive assessment and further management.. Hope this helps you. Best wishes for your health and future.