Don't move in with her. Don't sign the lease.

She is being COMPLETELY unreasonable on this one. People who need a service dog usually need them everywhere they go in order to function. The fact that your girlfriend can be out of the home overnight and sleep just fine is an indication that this is not one of the more serious cases where a support animal is necessary for functioning. That is, she has an emotional support animal, NOT a service dog (there is a difference!). She won't budge and is placing a dog above you. Don't put up with this. Don't move in with her. I am not bipolar, but I do have PTSD with severe sleep issues. My sleep issues seem to be a helluva lot worse than hers, to be honest, as it is extremely difficult for me to sleep anywhere but my own bed (even the couch down stairs is problematic). If she can sleep outside of the home without the dog, she does not "need" the dog, rather she "wants" the dog in her bed. Sleep issues don't just change when you leave the home and suddenly get better. That's not how they work.