About half of adults have an occasional nightmare, and somewhere between 2 and 8 percent have them often enough to count as a disorder. The difference matters, because frequent nightmares are treatable — they are not a personality trait.
WHAT COUNTS AS A NIGHTMARE. A nightmare is a disturbing dream that wakes you up and leaves you alert and oriented, usually with a clear memory of it. That distinguishes it from a night terror, where the person appears terrified but is not awake and remembers nothing. Nightmares happen mostly in the second half of the night, when REM sleep dominates.
THE USUAL TRIGGERS. Stress and anxiety top the list, followed by trauma, irregular sleep schedules, sleep deprivation, and late-night alcohol. Several common medications — some antidepressants, blood pressure drugs, and anything that changes REM sleep — can increase nightmares. Withdrawal from alcohol or certain medications can trigger a burst of intense ones.
THE DIET AND TEMPERATURE MYTHS. Eating late does not cause nightmares directly, but anything that fragments sleep — reflux from a late heavy meal, a bedroom that is too warm — increases awakenings during REM and therefore nightmare recall. A cool room around 65 to 68°F is not a cure, but it removes one common disruptor.
IMAGE REHEARSAL THERAPY. The best-supported treatment for frequent nightmares is surprisingly simple: while awake, write down the recurring nightmare, change the ending to something neutral or positive, and mentally rehearse the new version for a few minutes each day. Clinical studies show it reduces nightmare frequency substantially, often within weeks. It is the first-line treatment recommended by sleep medicine guidelines.
WHEN NIGHTMARES FOLLOW TRAUMA. Recurring nightmares are one of the hallmark symptoms of PTSD. If your nightmares replay or circle around a traumatic event and you have had them for more than a month, that is a reason to see a professional — trauma-focused therapy treats both the nightmares and the underlying condition.
SLEEP APNEA CAN MASQUERADE AS NIGHTMARES. Choking, gasping, and suffocation dreams that wake you with a racing heart can be your brain narrating a real breathing event. If a bed partner reports snoring or breathing pauses, a sleep study is the right next step — treating the apnea often ends the nightmares.
WHAT DOESN'T HELP. Trying to suppress the content, drinking to knock yourself out (alcohol worsens REM rebound), and sleeping less to avoid dreaming all backfire. So does white-knuckling through months of frequent nightmares when a brief course of image rehearsal would likely help.
BOTTOM LINE. Occasional nightmares are normal. Frequent ones — weekly or more, or distressing enough to affect your days — respond well to treatment, starting with image rehearsal therapy. Trauma-linked or choking-type nightmares deserve a doctor's input, not endurance.