[ford_o]

Wait, that's exactly what has been happening to me for the past few weeks. Each night I woke up after 2 hours of sleep with heart racing. Then I woke up another 2 times, due to tingling in my arm. My heart was calmer at that point. I was wondering what could be the cause..

[tjohns]

That could be a lot of things, including sleep apnea. A formal sleep study is a good place to start.