A sleep specialist will likely also try to help you get to the root of your insomnia (if there is one). Many of us can recall the occasional sleepless night when stress kept us tossing and turning. But there are a number of other causes of insomnia. Here's a look at the few of the most common. Any condition that leaves you in discomfort can understandably disrupt your sleep. Arthritis, low back pain, acid reflux, fibromyalgia -- these and many more painful conditions can keep you up at night.