Levodopa and daytime sleepiness

I’ve been taking levodopa for 10 plus years slowly increasing to 800-1000 mg per day. I am now experiencing daytime sleepiness. Before starting levodopa I had severe daytime sleepiness but this resolved when I started treating my PD. I have tried to cut back on my medication and it does reduce my sleepiness but at the expense of more stiffness and pain. Any suggestions for how to deal with this?