I've had different pets(including cats) to talk and twitch in their sleep. We(people) do it too . I hope that you can figure out her tummy trouble so she can be fixed. They usually keep going into heat until bred or fixed Have you tried fasting her for a day or two? Just let her have water for a day or two. We've had to do that before. It seems to let the "bug" run through the system. You might also try just feeding her a mild dry food; some cats can be very sensative to food changes. We have one that gets diarhea if she even eats a little of a different food. BTW we feed Natural Life organic cat food. Good luck