Caffeine - Or in other words "hyper juice"

I have a dilemma that maybe you can help me with. When I drink just one cup of coffee in the morning I end up completely jittery and over-hyper about an hour after. So yesterday I tried to go without. That caused a three-hour nap by four o'clock in the afternoon. I can't do that every day. But I also can't quite handle the shakes. Any ideas?