Continuous Spike-Waves during Slow Sleep Today: An Update.
CSWS can masquerade as autistic regression, but proven ABA sleep tools already exist—just use them.
01Research in Context
What this study did
Posar et al. (2024) wrote a narrative review about continuous spike-waves during slow sleep (CSWS). CSWS is a rare brain-wave pattern that can erase skills kids already have.
The authors looked at current tests, drugs, and monitoring ideas. They also flagged gaps where ABA tools are missing.
What they found
The review says CSWS can look like autistic regression. Language, play, and toilet skills can slip away after nights of silent seizures.
No agreed-upon ABA sleep checklists or behavior plans exist yet. Doctors and BCBAs are still guessing.
How this fits with other research
Luiselli (2021) and Abel et al. (2017) already give ready-made ABA sleep tools. They show how to track bed-time behavior and use bedtime fading or sleep hygiene. Posar says these tools are missing, but the tools are already on the shelf. The gap is simply using them with CSWS kids.
Giannotti et al. (2008) and García-Villamisar et al. (2017) found that kids with autism plus regression have more epilepsy and worse sleep. Their data support Posar’s warning that regression plus odd EEG should trigger a CSWS check.
Kılıçaslan et al. (2025) map the fast-growing sleep-in-ASD field. Their 2025 scoping review would include Posar’s 2024 paper, showing CSWS is now part of the bigger sleep-autism story.
Why it matters
If a child loses words or toileting after new sleep problems, ask for an overnight EEG. While you wait, run the same ABA sleep assessment Luiselli and Abel describe. Track bedtime latency, night wakings, and daytime problem behavior. You will gather baseline data the neurologist needs and you can start bedtime fading or positive routines right away. No need to reinvent the wheel—use the tools we already have and document if they ease the daytime skill loss.
Get CEUs on This Topic — Free
The ABA Clubhouse has 60+ on-demand CEUs including ethics, supervision, and clinical topics like this one. Plus a new live CEU every Wednesday.
Pull a 7-night sleep log and start bedtime fading tonight while you request an EEG.
02At a glance
03Original abstract
In the context of childhood epilepsy, the concept of continuous spike–waves during slow sleep (CSWS) includes several childhood-onset heterogeneous conditions that share electroencephalograms (EEGs) characterized by a high frequency of paroxysmal abnormalities during sleep, which have negative effects on the cognitive development and behavior of the child. These negative effects may have the characteristics of a clear regression or of a slowdown in development. Seizures are very often present, but not constantly. The above makes it clear why CSWS have been included in epileptic encephalopathies, in which, by definition, frequent EEG paroxysmal abnormalities have an unfavorable impact on cognitive functions, including socio-communicative skills, causing autistic features, even regardless of the presence of clinically overt seizures. Although several decades have passed since the original descriptions of the electroclinical condition of CSWS, there are still many areas that are little-known and deserve to be further studied, including the EEG diagnostic criteria, the most effective electrophysiological parameter for monitoring the role of the thalamus in CSWS pathogenesis, its long-term evolution, the nosographic location of Landau–Kleffner syndrome, standardized neuropsychological and behavioral assessments, and pharmacological and non-pharmacological therapies.
Children, 2024 · doi:10.3390/children11020169