Inclusion Criteria:

1. Having an established diagnosis of Multiple Sclerosis (MS) and being included in the Norwegian MS registry
2. Being 18 years or older
3. Scoring at least 12 points on the Insomnia Severity Index
4. Willing and able to provide written informed consent

Exclusion Criteria:

1. Self-reported symptoms of sleep apnea: Positive endorsement of a screening question for sleep apnoea (the item asks if they 'usually or everyday snore and stop breathing and have difficulties staying awake during the day')
2. Self-reported surgery for heart disease the last two months
3. Currently in an attack phase of MS and/or on treatment with steroids,
4. Self-reported night shifts in their work schedule,
5. Inadequate opportunity to sleep or living in circumstances that prevent modification of sleep pattern (e.g. having an infant residing at home),
6. Pregnant in the last two trimesters
7. Unable to get into bed or out of bed without human assistance.
8. Concomitant psychological treatment for sleep problems