My sinemet worked fine for quite a while but I was having trouble sleeping due to stiffness so I began to take sinemet CR 200/50 at bedtime. Once I started doing this my meds during the day dropped off. They used to work for 4-5 hours each dose but now they only work for 2 hours each dose. Has anyone experienced this and if so what can be done about it? Should I stop taking the nightly sinemet and then have insomnia to get my meds working again? Please help me with this one.