Dark therapy and blue-light blocking

Domain IX · Biomedical, neuro & digital

What it is

Dark therapy is the use of extended darkness as an add-on to standard medical treatment of acute mania. Its practical successor, sometimes called "virtual darkness", uses amber or orange blue-blocking lenses (or blue-depleted room lighting) so that the brain receives a physiological signal of…

Format

• The sources describe a medical adjunct, not a staged therapy, so there is no published phase model or session count for the psychotherapist. The phases below organise the therapist's work around the course of a manic episode, anchored where possible in the sources.
• Format: short contacts, no exploratory work during acute mania.

Who practises it, and how they are trained or regulated

• Who delivers it and status. This is a medical adjunct ordered and supervised by the psychiatric team, so far mainly in hospital. It is not a psychotherapy. As of October 2026, per the sources consulted, the ISBD task force supports hospital-based adoption of dark therapy (including blue-blocking lenses) as an adjunct in acute mania and considers it contraindicated in acute bipolar depression; outpatient and…

Evidence status, as the guide reports it

• Goals: help the client make sense of the episode and the treatment; a shared picture of the role sleep and light played; clarify, with the prescriber, whether any lens use continues at home (evidence for outpatient use is limited; this is the prescriber's decision).

Questions to explore with your client

• What drew you to it, and what are you hoping it will change?
• Does it involve fasting, a special diet or 'detox'? Have you discussed this with your doctor?
• Is it a group, retreat or community? How do they respond if someone wants to leave or raises a concern?
• How do you and the practitioner understand what is happening, in spiritual or cultural terms? Is that a source of comfort, worry, or both?
• Does it use a device, heat, cold, water or a physical procedure? Has a medical professional checked that it is safe for you?
• Who runs it, and what training or registration do they hold?
• What actually happens in a session or meeting, and how often?
• What does it cost, and is there pressure to commit to more?
• How do you feel afterwards, in the hours and days that follow?
• Does it fit with, or clash with, the work we do here?

What practitioners of it watch for

• rapid mood shifts. Working: client and family use the plan.
• plan not shared or outdated. Working: early contacts when signs appear.
• sedation plus darkness; alcohol. Working: no injuries; safety plan written.
• sleep shortening after discharge. Working: stable routines, early help-seeking.
• the client feeling it is imposed. Working: the client can state reasons and risks.

When to involve someone else

• New or worsening physical symptoms, or advice to stop or change prescribed medication: involve the client's doctor or prescriber.
• Signs of coercion, isolation from family and friends, escalating costs or secrecy: discuss openly and consider safeguarding.
• A crisis or thoughts of suicide: follow your crisis protocol. In the US, call or text 988; in the UK and Ireland, Samaritans on 116 123.

Drawn automatically from the guide's own sections. Stay curious: neither endorse nor dismiss what the client values, and check anything that matters against the full guide and its sources. Not medical advice.