Actigraphy and Nocturnal Heartrate Variability in Cluster Headache Patients

A small computer in the shape of a wristwatch, that registers movement and assesses sleep quality.

A small computer that registers variation in heart rate, which reflects cardiac autonomic tone.

A handheld infrared camera that sends out a light flash and records the pupil as it contracts and dilates, as a measure of pupillary autonomic tone.