The purpose of this study is to determine whether MYODM (formulated composition containing Theobroma cacao supplemented with caffeine (caffeine/theobromine ratio1/1.85, w/w) is effective in the treatment of excessive daytime sleepiness due to myotonic dystrophy type 1 (DM1) and improves the quality of life of these patients.

Detailed Description:

Myotonic Dystrophy type I (DM1) is the most common form of adult muscular dystrophy, affecting 1 in 8000 individuals. It is an autosomal dominant disorder with multisystemic involvement of multiple organs and tissues, mainly brain, heart, endocrine system, eyes and both smooth and skeletal muscles.

Hypersomnolence is one of the most frequently reported symptoms in patients with DM1 and often lead to handicap such as cessation of employment and withdrawal from social activities. The present project is a 6 month randomized study to assess the effect of MYODM on fatigue, hypersomnia and quality of life in DM1 patients.The patients will be randomized to one of the two study arms. The active arm will receive the MYODM treatment and the control arm will not but both will follow the same evaluation program.

Patients will come to the center every 3 months for evaluations.

Inclusion Criteria:

• Able to provide informed consent
• Genetically proven DM1
• Able to walk independently

Exclusion Criteria:

• Regular intake of plant stanols or other nutritional supplement
• Co-morbidity interfering with the interventions or possibly influencing outcomes.
• Participation in another clinical trial at the same time
• Unable to complete study questionnaires.