These treats before bedtime:
Pet Naturals Calming Chews for Cats

https://www.amazon.com/Pet-Naturals-Vermont-Behavioral-Supplement/dp/B015XMKZQI

Use one of those calming pheromone plug ins or sprays. You will have to use trial and error with that as they don't work for some people. I think the multi cat formula works best even if you don't have multiple cats.:

https://www.amazon.com/CEVA-Animal-Health-MultiCat-Diffuser/dp/B01AVHPFDS