My Son Had His 1st Seizure At 18 Months. Like

My son had his 1st seizure at 18 months. Like clock work he had them every 6 weeks until he was 4yrs old, when he was diagnosed with epilepsy. From 4-19yrs old he was on phenobarbital & his seizures were controlled. By age 20yrs, the Dr.said he had outgrown his condition. He went 20yrs seizure free. Now he is 45 yrs old & his seizures have returned with a vengeance. The last 3 have been in his sleep (this never happened before) during the early hours of the morning. He takes his meds (kepra) as prescribed , practices excellent daily nutrition and exercise, was an athlete in his younger years. I'm concerned because his seizures (grand mal) are becoming more frequent & attacking him in his sleep. What can we do to better monitor &/or control his seizures.? Also, Would you recommend the use of oxygen . He currently uses a CPAP for his sleep apnea. Thank you.