Everyone's experience is different, but here's a few ideas (I'm a PwP, not a medic):
- stress makes the tremors worse;
- Sinemet has a variable impact on tremors. Two doses per day is, in my experience, unusual: 3 or 4 doses per day is more common. Levodopa has a short half life, so he must be running out between doses. Perhaps he should ask his doctor about this;
- I get a limited, brief relief from my tremor, by consciously moving my hand a few millimetres at right angles to the tremor.

John