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![bryan_johnson Avatar](https://lunarcrush.com/gi/w:24/cr:twitter::17468569.png) Bryan Johnson [@bryan_johnson](/creator/twitter/bryan_johnson) on x 625K followers
Created: 2025-07-21 21:40:00 UTC

1/ The study is based on 4196 adults (age 26-74, 18-years of follow-up). Beyond increasing risk of premature death before 75, the findings showed that weekly nightmares accelerated aging, based on X epigenetic clocks:
+ Speed of aging (DunedinPACE)
+ Time until death prediction (GrimAge)
+ How old your body behaves physiologically (PhenoAge)

Nightmares are scary for your health. 

They cause nocturnal stress on your body:
+ Resting heart rate jumps by up to 10bpm
+ Heart rate variability falls (bad for recovery)
+ Cortisol spikes, sympathetic activation, and accelerated breathing

Nightmares are more common during periods of high stress, in those with anxiety disorders, and in anyone with trauma‐related conditions like PTSD.


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