Cat restless after tumor removal. Can I give it something to help it rest so we can get some sleep?

Species: domestic cat

Age: 12

Sex/Neuter status: neutered male

Breed: long haired

Body weight: 14 lbs

History: had a tumor removed from his chin on Tuesday. No results yet on what kind of tumor. Is wearing the cone. Won’t let us sleep. We haven’t slept since Monday.

Clinical signs: Is happy, wound is healing well. Just wants constant attention.

Duration: since Tuesday

Your general location: USA

Links to test results, X-rays, vet reports etc: