Bright Light Therapy as Possible Treatment Option for MS-Fatigue

Materials and methods: * visual analogue scale (4x/day for 6 weeks; measuring fatigue) * wrist actigraphy (6 weeks) * sleep diaries (6 weeks) * polysomnography (2x) * multiple sleep latency test (2x) * 4 subtests of the TAP (Testbatterie zur Aufmerksamkeitsprüfung; Alertness, Vigilance, Go/No-Go, Split Attention) * questionnaires (Fatigue Severity Scale, Epworth Sleepiness Scale, Pittsburgh Sleep Quality Index, Beck Depression Inventory, Beck Anxiety Inventory, Modified Fatigue Impact Scale, Morningness-Eveningness Questionnaire)