Re: could this be nerves?
You could very well have low blood sugar (hypoglycemia). I have it and I often shake. Try avoiding sweets and caffiene. Eat more protien than carbs and see if you see a difference. A quick test... if you are trembling when you wake up, have something sweet- orange juice, a cookie, whatever. If the shaking stops, it's a good indication of hypoglycemia. Then talk to your doctor. There is a test to see if you have it. It's a bit long, but no big deal.
Also, probably the first thing you should try is cutting out the late night sweets and replacing them with protien at best or nothing at all if you must. Protien is better because it turns to sugar very slowly and therefore, has a lesser affect on your blood sugar. You may not have low blood sugar, but having the sweets before bed may cause you to have boughts of low blood sugar, even though you are otherwise normal.