Late night lack of passion

My SO and I have been together for a year and a half. We're getting married in April. However, we are like day and night when it comes to sex. I have a very high sex drive so once I start I want to keep going...at least til I cum. He likes to wake me from my sleep for it but as soon as he's done he's sleep and I'm laying there like "really?" because I didn't bust. I use vibrators behind his back because I don't want him to feel like he's not pleasuring me...he is but he always cums before I do. How do I explain this to him without bruising his ego?