I think you have grounds for thinking he may be bipolar. Anti-seizure (convulsant) medication is very commonly used to treat mood disorders. Hypo-mania( a less intense form of mania) can make a person seem like a hard worker, outgoing, funny and stimulating. When I am hypo-manic I don't feel like I need a lot of sleep. I am very productive and have a take on the world attitude. We can't diagnose anything but we can tell if we do relate and I can see many consistencies in what you describe in the man you explain in myself and I am bipolar.

I recommend doing some reading about the difference between mania and hypo-mania so you can see the difference. Mania can be very scary where hypo-mania can seem like a good trait.