Abstract
Mood disorders are often characterised by alterations in circadian rhythms, sleep disturbances, and seasonal exacerbation. Conversely, chronobiological treatments utilise zeitgebers for circadian rhythms such as light to improve mood and stabilise sleep, and manipulations of sleep timing and duration as rapid antidepressant modalities. Although sleep deprivation ("wake therapy") can act within hours, and its mood‐elevating effects be maintained by regular morning light administration /medication /earlier sleep, it has not entered the regular guidelines for treating affective disorders as a first‐line treatment. The hindrances to using chronotherapeutics may lie in their lack of patentability, few sponsors to carry out large multicentre trials, non‐reimbursement by medical insurance, and their perceived difficulty or exotic "alternative" nature. Future use can be promoted by new technology (single‐sample phase measurements, phone apps, movement and sleep trackers) that provides ambulatory documentation over long periods and feedback to therapist and patient. Light combinations with cognitive behavioural therapy and sleep hygiene practice may speed up and also maintain response. The urgent need for new antidepressants should hopefully lead to reconsideration and implementation of these non‐pharmacological methods, as well as further clinical trials.
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