Understanding nightmares
Nightmares are vivid, distressing dreams that wake you, usually from later dreaming sleep, and that you remember clearly. Night terrors are different: they happen earlier, involve screaming or thrashing while still asleep, and are rarely remembered at all. Night terrors are more common in children and usually outgrown.
Recurring nightmares are strongly associated with trauma, but not only with it. Bereavement, high stress, poor sleep, alcohol, and withdrawal from some medications all raise them. In post-traumatic stress they often replay the event and are one of the most persistent symptoms.
The important and under-known point is that nightmares are treatable in their own right. They are usually assumed to be a symptom that will fade once everything else is dealt with. In practice, targeting them directly works, and sleeping again tends to improve everything else.
Signs to look for
Everyone experiences some of these sometimes. What matters is how many, how long, and how much they interfere with your life.
The dreams
- The same dream, or the same theme, returning over weeks
- Waking fully, frightened, and remembering it in detail
- Replaying a real event that happened to you
- Waking with a racing heart, sweating or shouting
The knock-on effects
- Delaying bedtime to avoid sleeping
- Fear on waking that lasts into the morning
- Daytime exhaustion, irritability and poor concentration
- Avoiding sleeping alone, or sleeping with the light on
When to seek help
You do not need to be in crisis to deserve support. Consider speaking to someone if:
- They have recurred for more than a month, or you are avoiding sleep
- They follow a traumatic event and come with flashbacks or being constantly on edge
- You are drinking to get to sleep
- A child has them alongside a change in behaviour, withdrawal, or fear of a particular person or place
What helps
Imagery rehearsal therapy
The best-evidenced treatment for recurring nightmares. You rewrite the dream while awake, with a different course and ending, and rehearse that version. It is brief, usually a handful of sessions, and it works more often than people expect.
Treating the trauma underneath
Where nightmares are part of post-traumatic stress, trauma-focused therapy addresses both. Nightmares are often the first symptom to shift, which makes the rest more bearable.
Steady sleep and no alcohol before bed
Sleep deprivation and alcohol both increase dream intensity and fragment the night. Alcohol in particular helps you fall asleep and then reliably worsens the second half of it.
A wind-down that is not the news
What you take into sleep matters. Distressing content in the last hour before bed measurably feeds dream content.
Common questions
Do nightmares mean something is wrong with me?
Not by themselves. Everyone has them. A repeating pattern that disturbs your sleep or makes you dread bedtime is worth attention, and it is worth attention as a problem in itself rather than only as a symptom.
Do they mean I have PTSD?
Not necessarily. Nightmares are common in post-traumatic stress but also follow ordinary stress, grief, illness and disrupted sleep. If they replay a specific event and come with flashbacks and hypervigilance, that is worth assessing properly.
Should I try to work out what the dream means?
Interpretation is not what makes the difference. Changing the rehearsed content of a repeating dream does. Meaning can be interesting; it is rarely the mechanism of improvement.
My child wakes screaming but does not remember it.
That pattern sounds more like night terrors than nightmares. They are common between three and twelve, usually harmless, and generally outgrown. Do not wake the child; keep them safe and let it pass. Raise it with a paediatrician if episodes are frequent or involve injury.