I've been taking Lyrica for about 8 months and at first it worked well for me. I've just had a bad acute virus and have had to sleep longer hours; as usual, now I'm getting over it, I can't get to sleep at night and am waking late because my sleep pattern has shifted forwards. Maybe once I've gradually moved back to my normal pattern I'll find the Lyrica is effective again. Or not! People say that you have to change your sleep meds periodically because your body adapts to them. I've already had to quit Amitryptyline for this reason. How long does each sleep med usually work before you can expect to have to move on to another? Can you ever return to one that used to work?