Increased heartbeat-evoked potential during REM sleep in nightmare disorder.

Then we used a Fisher r-to-z transformation for these r values, and the one-tailed p value for the difference between these coefficients was 0.059, which indicates a statistical trend for significance. 4 Discussion The current study is, to our knowledge, the first to quantify neural responses to cardiac signals in patients with nightmare disorder and compare it with healthy controls.

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