I’ve unfortunately been dealing with a heightened panic disorder mostly due to in part to some overwhelming life factors that caused a flare up of PVCs (heart palpitations). 

Took Xanax XR 1 mg the last couple nights to help with sleep. It worked better than anything else I’d tried.  But just now tonight I took .5 mg around 10 (I didn’t want to take it all too early and wake up earlier) and woke up having a panic attack at 11, which including shaking and trembling. I took 1mg more and that seemed to calm things down about 40 minutes later but then I fell asleep for about 15 minutes and again woke up in another shaking panic, albeit somewhat less severe. 

Has anyone experienced this? Am I simply just not taking enough? Or is this a side effect? I kinda feel like having regular Xanax IR could’ve quelled the 11 pm panic but all I have is XR and had to wait it out. Has anyone been prescribed both IR and XR to take in conjunction? I had previously been using klonopin but my doc wanted to switch to Xanax since it’s longer lasting.