if she really cares she will either cut the friendship or keep it professionally to work only and not text back on her free hours, i had a female friend who had something like that going on while she was in a relationship and the guy asked her out for a drink her bf said it was okay to go but she stopped talking to the friend because she knew something may have happened and she has been cheated on before and didn't want to put her bf through the pain, she flirted for the fun of it because she was bored she wasnt looking for a hook up was all for a bit of banter but she still loved her bf i think she changed jobs and blocked the guy on social media i know she left the job but not sure if it was because of the guy, not saying your girl has to change jobs especially if she loves it but mabey if she really wants things to work out with you she might be open to changing shifts so she talks to him less in person or lets him know that her boyfriend you is getting effected with thier friendship an it might make them talk less or stop talking altogether,

your the man be a little more controlling let her have her friends but the flirting and her talking about him constantly has to stop and if she doesn't listen and keeps flirting especially if shes the one who started it and does not want to change anything to make you happier to build your trust with eachother or if she acts like she stopped talking to him but still is then just get the **** outa thier man it will be for the best and you will realise that once your out.

I will say her saying his name in her sleep is weird and must be hard for you, but ask her what was she dreaming about and if she doesn't say work about a funny thing a friend said or it doesnt sound like its to do with anyone she knows and sounds like shes making stuff up about her dream call her out on her bs and if an argument starts dont feel bad its not your fault your just looking for answers to make sure the relationship your in is solid,
i have been told i have been in a friends dream before and it wasnt sexual i hope atleast lol and it wasnt a reocurring thing were they kept dreaming about me was a one time thing were i probably did something halirious with them so it may sound alarming at first but it might be nothing but id say be on the suspicious side first try find out whats going on in your girls head