Figure 2From: Sleep-related and non-sleep-related migraine: interictal sleep quality, arousals and pain thresholds Cold pain thresholds and D-burst index in sleep related migraine (SM, solid line) and non-sleep related migraine (NSM, dotted line). Cold pain threshold is expressed as the difference from baseline. KD-bursts are significantly associated with cold hyperalgesia (age-adjusted r = -0.59, p < 0.01).Back to article page