I can only speak from a mono point of view- but I noticed early on that my wife has a sort of transition period when she comes home when she is a bit quiet. It sometimes lasts a couple of hours. The other guy says she is the same there when she first arrives and when she is getting ready to leave. It is as if she needs to get used to us again. It is not a problem as long as we don't expect too much interaction when she first arrives.
I know this doesn't answer your question fully but it is kind of related I think.
"The secret of life, though, is to fall seven times but to get up eight times"