I have a new kitten - totally gorgeous! - and bought a Feliway diffuser to make introducing her to my other kitten (6 months older) easier. Despite a bumpy start, after 3 days the two kittens are inseparable which is lovely to see but I notice they sleep a lot more, usually curled up together. The kitten is not very playful anymore, she just sleeps a lot. Can it be the Feliway diffuser working too much and would it be advisable to switch it off now that they get on well? Picture attached...