“Sleep restriction therapy for insomnia didn’t work for me.”
This is a common sentement we hear from people seeking help for insomnia. Often, it is said with frustration, disappointment, or self-doubt, especially after someone has genuinely tried to follow the rules and found the experience exhausting or unsustainable.
Importantly, current research suggests that this experience is not unusual, and it does not mean CBT-I and time in bed restriction* is unsuitable or ineffective. Instead, it highlights why how bedtime restriction is delivered matters just as much as whether it is used.
*The terms ‘sleep restriction’ and ‘time in bed restriction’ refer to the same thing, we prefer the term time in bed restriction, because this better reflects the process.
Sleep restriction is effective, but it is also challenging
Time in bed restriction therapy is a core component of cognitive behavioural therapy for insomnia (CBT-I), the recommended first-line treatment for chronic insomnia. It works by temporarily limiting time in bed to build sleep pressure, consolidate sleep, and stabilise sleep–wake rhythms.
At the same time, it is widely recognised as the most demanding part of CBT-I.
A 2025 qualitative study published in the Journal of Sleep Research explored why people struggle with bedtime restriction and why some disengage before benefits emerge. The study involved in-depth interviews with 23 adults who had participated in internet-delivered CBT-I. While this is a relatively small sample, the richness of the data provides valuable insight into patient experience, and the themes identified closely mirror what is commonly seen in clinical practice. (Simon et al., 2025, full reference below).
Why people drop out or struggle with sleep restriction
The study found several factors that made people more likely to discontinue or reject sleep restriction altogether:
- previous negative experiences with sleep restriction
- strong next-day effects such as fatigue, irritability, or reduced concentration
- scepticism about whether the process would help
- feeling that the approach conflicted with work demands, health conditions, or daily life
Crucially, these difficulties were not about lack of motivation. Many participants were highly committed and distressed by their insomnia, yet still found the approach hard to tolerate when it felt too rigid or poorly matched to their circumstances.
“When sleep restriction feels hard, it doesn’t neccesarily mean it’s failing. It can mean the approach needs to be adjusted to become more manageable, and given just a bit more time. In our clinical work, we see that when treatment is paced, personalised, and properly supported, people are far more likely to persist and benefit.”
Dr Melissa Ree, Clinical Psychologist & Director, Sleep Matters Perth
One size does not fit all in CBT-I
A central concept emerging from this research was perceived individual fit. People were more likely to persist with time in bed restriction when it felt tailored, flexible, and responsive to their needs, rather than imposed as a fixed protocol.
This aligns closely with our clinical practice. Sleep restriction can be adapted in many ways, including:
- pacing changes more gradually
- adjusting the position and length of the sleep window
- monitoring daytime functioning closely
- modifying the approach when health, mood, or life demands fluctuate
Effective CBT-I is not about forcing people to endure discomfort. It is about applying evidence-based principles with clinical judgement and collaboration in the service of clients achieving outcomes that are important to them.
A reassuring finding about insomnia severity
One of the most encouraging findings from the qualitative study was that people who felt highly burdened by their insomnia were often more likely to persist with bedtime restriction and benefit from it, provided they felt supported and the approach was well matched to them.
In other words, severe insomnia did not predict failure. If anything, distress sometimes increased motivation to engage and persist, as long as the treatment felt safe and workable.
What happens during sleep restriction, week by week
A second 2025 study helps explain why sleep restriction can feel difficult early on, yet still lead to meaningful improvement.
Looman and colleagues used a network analysis of a randomised controlled trial (N = 147) to examine how symptoms and sleep processes change during sleep restriction therapy, week by week. This type of analysis allows researchers to see which symptoms improve first and how changes unfold over time.
Their findings are clinically important:
- Night-time sleep improves early. Difficulty falling asleep, staying asleep, and early morning awakenings reduced from the first weeks of treatment.
- Pre-sleep anxiety and arousal reduce later. Cognitive and physiological arousal before bed decreased from around weeks three to six.
- Sleep onset latency shortens. People fell asleep more quickly as treatment progressed.
- Sleep–wake patterns become more consistent. Bedtimes and rise times stabilised early, supporting circadian regularity.
- Unhelpful sleep behaviours reduce indirectly. Safety behaviours and compensatory habits decreased over time as sleep improved.
- Daytime sleepiness can worsen briefly, then improve. There was a temporary increase in daytime interference early on, followed by improvement as sleep consolidated.
This helps explain a common clinical pattern: the early phase of sleep restriction can feel uncomfortable, even discouraging, before benefits become clearer. Understanding this trajectory can reduce fear and improve engagement.
Why support and adaptation make such a difference
Both studies highlight the importance of therapeutic guidance, expectation setting, and monitoring. People were more likely to persist when they understood why discomfort might occur, knew it was temporary, and felt able to adjust the plan if needed.
In practice, this means:
- acknowledging and problem solving concerns about safety, fatigue, and functioning
- monitoring mood, pain, and health symptoms alongside sleep
- adapting rather than abandoning the approach when difficulties arise. Time in bed restriction can actually be applied in a highly personalised way.
Time in bed restriction is not about pushing through at all costs. It is about using a powerful tool carefully and skilfully.
If sleep restriction has not worked for you before
If you have tried time in bed restriction in the past and found it unmanageable, that experience deserves to be taken seriously.
It may reflect that:
- the approach was introduced too quickly
- it was not sufficiently tailored
- side effects were not adequately addressed
- support was limited at critical points
These are treatment issues, not personal failures.
A final thought
CBT-I remains the most effective, evidence-based treatment for chronic insomnia. Time in bed restriction is a key component, but it works best when applied with flexibility, clinical expertise, and respect for individual differences.
Good sleep treatment is not about rigid rules.
It is about collaboration, pacing, and fitting evidence-based care to real lives.
References
Simon, L., Steinmetz, L., Berghoff, N., Rehm, C., Neumann, L.-M., Küchler, A.-M., Riemann, D., Ebert, D. D., Spiegelhalder, K., & Baumeister, H. (2025). Barriers and facilitators of sleep restriction therapy in internet-delivered CBT-I: A qualitative content analysis and the development of a treatment path model. Journal of Sleep Research, 34, e70018. https://doi.org/10.1111/jsr.70018 Simon et al 2025- CBT-i via TH …
Looman, M. I., Schoenmakers, T. M., Kamphuis, J. H., Blanken, T. F., & Lancee, J. (2025). Understanding sleep restriction therapy: A network intervention analysis of symptom- and process-level change. Sleep. Advance online publication. https://doi.org/10.1093/sleep/zsaf360 Understanding sleep restriction…
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