Circadian Rhythm and Attack-timing in Episodic Cluster Headache Patients in- and Outside of Bout: an Actigraphic Study

PATIENTS Inclusion Criteria: * Age between 18 and 65 years of age * Episodic cluster headache * The patient can differentiate cluster headache from other primary headaches if he suffers from any. Exclusion Criteria: * Circumstances, determined by the PI, that makes the patient ineligible. * Changes in preventive medication within 7 days before the study initiation and during the 2 weeks. * Changes in antidepressive medication or antipsychotic medication within 2 weeks before the study initiation and during the 2 weeks. * Serious somatic and/or psychiatric disorders * Alcohol intake \> 50 units pr.week * Pregnancy / breastfeeding * Patient cannot accept the conditions of the trial * Patient does not understand Danish. CONTROLS Inclusion Criteria: \- Age between 18 and 65 years of age Exclusion Criteria: * Circumstances, determined by the PI, that makes the patient ineligible. * Any primary headache more than 1 day / month * Diagnosed with a secondary headache * Treatment with antidepressive medication or antipsychotic medication within 2 weeks before the study initiation and during the 2 weeks. * Serious somatic and/or psychiatric disorders * Alcohol intake \> 14 / 7 units pr.week (males / females) * Pregnancy / breastfeeding * Patient cannot accept the conditions of the trial * Patient does not understand Danish.