Do you know anyone else who has a boyfriend that will never sleep the night? and how can I change this?

We have been together for 18 months and get on brilliantly in every way, we have no problems except for this sleeping with each other thing. I cannot imagine ending this relationship but after so long together it is frustrating to spend so many nights apart by myself. Even when we're intimate we have to get back up and I drive back home alone at night. I know this is his hangup not mine and I try to be patient and understanding and hope in time maybe it will change but I also feel unloved or unwanted occasionally and long to just cuddle up and enjoy some quality time together unrushed and without limitations. I have tried to explain this but he says that when he's asleep he is unaware and that he wants to spend all his waking time with me which is more important...he also says he has always been like this and cannot sleep with anyone else physically around him. He really isn't just using me and we do have a very close relationship and bond together but inside I still feel sad and almost a bit repressed by all this.... he also never expresses verbally that he loves me but says that I am the person he is closest to in all his life....what should I do about all this?