The circadian clock at the intercept of sleep and pain

aDepartment of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden bDepartment of Anesthesiology and Perioperative Medicine, Queen's University, Kingston, Canada cDepartment of Anesthesiology, Intensive Care, and Pain Medicine, Pain Clinic, Helsinki University Hospital, University of Helsinki, Helsinki, Finland *Corresponding author. Address: Pain Clinic, Helsinki University Hospital, Haartmaninkatu 2A (PB 140), Helsinki 00029 HUS, Finland. Tel.: +358-9-47175885; fax: +358-9-4717641. E-mail address: [email protected] (E. Kalso). Sponsorships or competing interests that may be relevant to content are disclosed at the end of this article.