A frightening dream can end while its effects carry into the morning. When nightmares recur, the useful question is how much they disrupt sleep and waking life. Imagery rehearsal therapy offers one treatment approach: changing the dream’s story whilst awake. The evidence supports discussing it with a clinician, but does not promise that every recurring nightmare will disappear.
When a bad dream becomes a sleep problem
Nightmares usually occur during rapid eye movement, or REM, sleep, which becomes more prominent later in the sleep period. A person typically wakes alert enough to remember the dream. That distinguishes a nightmare from some other frightening night-time events, although a description alone cannot establish a diagnosis. Mayo Clinic’s overview of nightmare disorder describes repeated dreams, distress, disrupted sleep, and difficulties during the day as the clinically relevant pattern.
The dream’s content is only part of that assessment. Fear of returning to bed, persistent daytime anxiety, or trouble functioning can matter as much as how often the dream occurs. An occasional upsetting dream does not establish a disorder. Equally, someone need not treat repeated distress as trivial simply because the frightening event happened during sleep. The distinction is the effect on life, assessed in context, rather than the apparent strangeness of the story.
The night-time event needs identifying
A nightmare and a night terror are different events. In a night terror, someone may appear frightened or move about whilst still asleep, and usually will not remember what happened. Nightmares are generally remembered after waking. NHS guidance on night terrors and nightmares also distinguishes sleep paralysis, in which a person cannot move or speak whilst falling asleep or waking. These descriptions help explain why different experiences should not automatically receive the same treatment.
For an appointment, a brief account of whether the person woke fully, remembered a dream, or was observed moving can be more useful than a label chosen online. The NHS recommends consulting a GP when regular nightmares affect sleep and everyday life. Its guidance also notes possible contributions from medicines, other sleep conditions, and anxiety. A discussion can therefore explore several explanations without assuming that every frightening awakening is psychological or that every recurring dream reflects trauma.
What imagery rehearsal changes
Imagery rehearsal therapy works with an altered version of a nightmare during waking hours. A therapist helps the person develop a less distressing narrative and rehearse the revised imagery. This is a structured psychological treatment, rather than an instruction to force pleasant thoughts at bedtime. Cleveland Clinic’s explanation of nightmare treatment describes identifying the dream’s elements and working together to rescript its narrative.
The important distinction is between practising a revised dream and repeatedly reliving the frightening original. A peer-reviewed expert consensus statement on cognitive behavioural therapy for nightmares advises clinicians to help patients rehearse the rescripted imagery. It also acknowledges that treatment manuals differ. There is no reason to turn one article’s description into a universal timetable for rehearsal.
That consensus is clinical guidance, not proof that one exact version works best. It identifies unanswered questions about the optimal amount of practice and about people who find mental imagery difficult. Someone who cannot readily picture a scene has raised a relevant treatment question, rather than failed the task. A clinician can discuss whether this approach fits their experience and what alternatives or adaptations might be appropriate.
Evidence supports an option, not a guarantee
The American Academy of Sleep Medicine’s 2018 position paper recommended image rehearsal therapy for nightmare disorder and PTSD-associated nightmares. The date matters: this is an established treatment position, not a newly discovered sleep technique. The paper combined assessment of the research with clinical judgement, and emphasised that individual care depends on circumstances and available resources.
A 2023 systematic review of psychosocial nightmare treatments included 69 studies, comprising 35 randomised trials and 34 non-randomised studies. It found substantial support for imagery rehearsal and related approaches, whilst identifying gaps in the evidence. That mixture of study designs matters. Random allocation offers a stronger test of treatment effects than improvement observed before and after a course of therapy without a comparison group.
Guideline bodies do not reach the same conclusion for PTSD-associated nightmares. Recommendation 33 of the 2023 VA/DoD PTSD guideline found the evidence insufficient to recommend either for or against imagery rehearsal therapy for those nightmares. Its assessment described inconsistent trial findings and very low confidence in the evidence. This PTSD-specific judgement differs from the AASM’s 2018 recommendation; it does not address nightmare disorder generally. For readers with PTSD, that disagreement is a reason to discuss the uncertainty and treatment choices with their clinician.
Why the comparison group matters
The limits become clearer in a 2024 systematic review and meta-analysis of imagery rescripting in military veterans. Its pooled data covered 15 studies involving 658 participants. Participants improved from before to after treatment, but comparisons with control groups found an advantage for sleep quality without a clear advantage for nightmare frequency.
These findings do not establish that rehearsal cannot help veterans. They show why a before-and-after improvement should not be read as the treatment’s entire effect. The authors cautioned that the studies were relatively few, methodologically weak, and varied considerably. A result from one population also cannot settle the likely benefit for everyone else. The reasonable conclusion is that rehearsal is an option with evidence behind it, whilst the size and consistency of benefit remain uncertain.
Trauma needs a broader assessment
Recurring nightmares can accompany post-traumatic stress disorder, but a dream alone does not diagnose PTSD. The NHS description of PTSD places recurring dreams alongside other experiences, including intrusive memories, avoidance, and feeling persistently on guard. Those daytime experiences belong in the conversation too.
Nightmare treatment and PTSD treatment have overlapping concerns, but their goals are not interchangeable. NICE guidance on PTSD recommends trauma-focused psychological treatments in defined circumstances. Recommendation 1.6.23 considers CBT targeting specific symptoms, such as sleep disturbance, for adults with PTSD or clinically important PTSD symptoms presenting more than three months after trauma only when they cannot or do not wish to engage in a trauma-focused intervention, or have residual symptoms after one. A person with trauma-related nightmares should have the opportunity to discuss that wider assessment, rather than being left with a dream exercise alone.
This article is not a self-directed trauma-exposure protocol. NHS inform advises seeking support when distressing reactions persist after a traumatic event or worsen. There is no need to wait for an arbitrary deadline when distress is severe. If someone cannot keep themselves or another person safe, NHS emergency guidance advises calling 999 or going to A&E.
What this means in practice
- Consider a short sleep diary before an appointment: record awakenings, remembered nightmares, and the effect the next day. Detailed retelling of distressing content is not required for that initial record.
- Arrange a GP discussion if recurring nightmares interfere with sleep or daily life. Mention fear of bedtime as well as the dreams themselves.
- Bring a list of medicines and note any recent changes. Ask whether they could contribute; do not alter prescribed treatment on the basis of this article.
- Ask whether imagery rehearsal or another psychological treatment is suitable, who provides it, and how improvement would be assessed.
- Mention trauma-related symptoms and any existing mental health care so that nightmare treatment can be considered within the wider plan.
These discussion points follow the NHS assessment and diary advice and the treatment evidence above. For people taking PTSD medicines, the NHS specifically advises against stopping them without medical advice.
What we don’t know
The research does not identify a single best rehearsal schedule, establish equal benefit across populations, or show that fewer nightmares necessarily means recovery from PTSD. The veteran meta-analysis and expert consensus both leave important questions open. Those uncertainties should shape expectations and follow-up, rather than erase an available treatment option.
A useful outcome is a night-time problem that receives a careful assessment and a treatment discussion proportionate to its impact. Recurring nightmares deserve that attention without a promise of perfect dreams.
Photo: Maria Orlova on Pexels.
