Is it safe to take clonazepam for sleep with sinemet (carbidopa and levodopa) for parkinsons patient? are there any drug interactions?

Probably safe...: ...but not especially the best choice! Although medications in that class (benzodiazepines) allay anxiety and can relax muscle spasm, they also interfere with normal sleep architecture and increase the risk of falling. I would certainly advise that you discuss this with your neurologist or a psychiatrist trained in sleep disorders or with additional training in geropsychiatry.

Drug interactions: You can use a drug interaction checker whenever you have questions about drug-drug interactions or drug - food interactions. Here is 1 option (Drugs.Com): https://www.drugs.com/drug_interactions.php Your pharmacist is also a good source of info.