How To Sleep‑Starve Insomnia

We know by now that simply lying in bed hoping to sleep isn’t the best thing to do for insomnia, but what is? For those suffering (which, according to the NHS is around 1 in 3), the routine of tossing, turning and clock-watching can actually strengthen the very patterns that stop sleep from happening.

Enter sleep-restriction therapy (SRT) - a clinical yet surprisingly simple technique that’s trending among sleep coaches, behavioural therapists, and wellness creators alike. Instead of spending more time in bed, SRT temporarily reduces it, using strategic “sleep deprivation” to increase your body’s natural sleep drive and reset your internal clock. Think of it as a sleep diet - one designed not to torture, but to retrain your brain to fall asleep faster and stay asleep longer.

To understand how it works, we spoke with Kathryn Pinkham, sleep expert and founder of The Insomnia Clinic, who has helped thousands of people use sleep-restriction therapy to break the insomnia cycle.

What is sleep-restriction therapy and why is it trending right now?

“Sleep-restriction therapy, or SRT, is a behavioural technique designed to consolidate sleep by temporarily limiting time spent in bed to roughly match the amount of sleep a person is actually getting,” explains Kathryn.

The idea sounds bizarre to most… how can less sleep time lead to better sleep? Kathryn says the answer lies in how the brain makes sense of it. “Restricting time in bed builds sleep pressure, making sleep deeper and more efficient.”

She admits that the name doesn’t help its reputation. “Many people hear horror stories about the technique and think they’ll be forced to stay awake until the early hours, leaving them even more anxious and exhausted,” Kathryn says. “But that’s not what SRT is about at all. I prefer to call it sleep scheduling as it sounds less terrifying.”

So, why now? “It’s gaining popularity because it has a strong track record in clinical research. It’s fast-acting for many people and it doesn’t rely on medication,” she explains. With rising awareness around behavioural sleep medicine and CBT-I (Cognitive Behavioural Therapy for Insomnia), SRT has become one of the most effective and scalable components of insomnia treatment.

In a time when sleep supplements and blue-light glasses dominate, sleep-restriction stands out for one key reason… It teaches your body to do what it already knows how to do and that’s sleep naturally.

The science: how restricting sleep actually helps you sleep better

If sleep is supposed to be effortless, why does restricting it help? According to Kathryn, it’s all about resetting your sleep drive: “When you restrict the window in which you’re in bed, you’re more likely to fall asleep quickly and stay asleep because your ‘appetite’ for sleep is higher.”

This ‘sleep pressure’ helps the brain relearn an essential association that bed = sleep, not frustration. “It helps retrain the brain to associate being in bed with consistent sleep rather than alertness,” she explains.

Over time, as sleep becomes deeper and more consolidated, the nervous system also calms down. “The hyper-arousal we see in chronic insomnia starts to down-regulate,” Kathryn says. “Eventually, the body stops ‘trying’ so hard to sleep and instead restores a natural, automatic sleep drive.” It’s the opposite of forcing it. It’s teaching your body to trust itself again.

The evidence behind sleep-restriction therapy

Sleep-restriction therapy isn’t new, but it’s one of the most rigorously tested treatments for insomnia. “SRT is one of the most studied behavioural interventions and is a core component of CBT-I which is the gold-standard and first-line treatment recommended by the NHS,” Kathryn explains. “Research consistently shows improvements in falling asleep, reduced waking and better-quality sleep.”

Clinical studies have found that within just a few weeks, people using SRT report significantly improved sleep efficiency (the proportion of time in bed spent asleep), fewer nighttime awakenings, and less anxiety about sleep itself.

So, who benefits most? “People with chronic insomnia, especially those who struggle to fall asleep, spend long periods awake in bed or nap frequently, tend to see the best results,” says Kathryn. “It’s also helpful for those who feel ‘wired but tired’ or who experience sleep-related anxiety.” She adds that it’s even more effective when paired with tools that address the mental side of sleeplessness: “For me as a therapist, I see that SRT works best when combined with tools to reduce vigilance and anxiety around sleep.”

Who should (and shouldn’t) try it

While SRT is powerful, it isn’t one-size-fits-all and Kathryn is clear that some people should approach it cautiously or with professional guidance. “SRT can be modified in most situations, but it should be used with caution or support in some circumstances,” she says. These include:

• Those with seizure disorders, bipolar disorder or untreated sleep apnea

• Those with significant daytime sleepiness or a history of accidents due to fatigue

• Older adults or those with medical vulnerabilities

• Individuals with severe anxiety, depression or other mental health concerns

“For these people, they can still benefit from the basics (like less time in bed), but they should adapt the programme and ensure they have support throughout,” Kathryn advises.

How to try sleep-restriction therapy at home

If you’re curious about trying SRT, Kathryn says a structured approach is key. A safe, basic process looks like this:

1. Track your sleep for seven days. “This gives you a baseline of your average sleep time compared to time spent in bed.”

2. Set your new ‘sleep window’. “If you’re in bed for eight hours but only asleep for six, then six hours becomes your new sleep window.”

3. Fix your wake-up time. “Decide your ideal wake-up time and work backwards. If you need to get up at 6am, your new bedtime is 12am.”

4. Be consistent and stick to it. “Even after a poor night, get up at the same time and avoid going to bed earlier than the new bedtime.”

5. Don’t go below five hours. “Even if you’re currently sleeping less than five hours, don’t make the window smaller than that.”

For those who find this intimidating, Kathryn suggests easing into it: “If the above makes you anxious, you can adapt by pushing your bedtime back a little and setting your alarm just a little earlier so you are gradually spending less time in bed.”

Importantly, she emphasises that SRT isn’t meant to feel like a punishment. “It should not be thought of as a ‘regime’ or torturous process. It’s simply a way to help your body understand the pattern you want and use your natural sleep drive to improve sleep quality,” she says. 

SRT vs CBT-I and other sleep techniques

So how does SRT differ from other insomnia treatments? “Sleep-restriction is one component of CBT-I but focuses specifically on timing and compression of sleep opportunity,” says Kathryn. “Stimulus control retrains the brain to associate the bed with sleep. For example, only going to bed when sleepy and getting up when unable to sleep, to avoid connecting the bed with wakefulness.”

CBT-I, on the other hand, takes a broader psychological approach. “It combines SRT with tools to reduce sleep-related anxiety, challenge catastrophic thoughts, calm hyper-arousal, and teach the body that it doesn’t need to activate the fight-or-flight response in bed,” she says.

Essentially SRT is the structural framework whereas CBT-I is the full toolkit. Both aim to help you relearn natural, effortless sleep.

Making sleep-restriction work with small daily habits

While sleep hygiene alone can’t fix chronic insomnia, it can make SRT more effective. “Sleep hygiene supports SRT and helps with feeling better overall,” Kathryn says. Here are some little tweaks that can really help:

• Keep routines stable, especially wake-up times

• Get morning light exposure to reset circadian rhythm

• Limit caffeine later in the day - ideally after midday

• Reduce overall stress with mindfulness, breathwork or journaling

Kathryn does warn against perfectionism though. “Sleep hygiene alone won’t reset your body clock or your mindset towards sleep once insomnia is chronic,” she explains. “In fact, too much focus on ‘perfect’ routines can add pressure and make sleep even harder.”

How to transition out of sleep-restriction therapy

Once you’re sleeping better, it’s time to gradually expand your bedtime again. “Transition is gradual,” says Kathryn. “As your sleep improves, time in bed gets extended in small steps, usually 15-30 minutes at a time.” But she encourages people not to obsess over the number of hours and instead focus on how you feel. Quality is more important than quantity and poor nights are normal.

The key to maintenance? Stay consistent. “As long as you stick to the basics (not too much time in bed, leaving the room if frustrated and managing sleep anxiety) your sleep should stay consistent,” Kathryn says. And if insomnia creeps back in? “We can briefly tighten the sleep window again to reset,” she adds.

The key takeaway: Sleep restriction isn’t about losing sleep… it’s about relearning it

Sleep-restriction therapy might sound extreme, but its goal isn’t deprivation… It's re-education. By temporarily limiting time in bed, you rebuild the body’s natural sleep drive, retrain the brain to associate bed with rest and reset your circadian rhythm from the inside out. “It’s simply a way to help your body understand the pattern you want and use your natural sleep drive to help you get better quality sleep.”

So while it may sound counterintuitive, the science (and success stories) suggest that sometimes, the fastest way to more rest is to sleep a little less first.

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This article is for informational purposes only, even if and regardless of whether it features the advice of physicians and medical practitioners. This article is not, nor is it intended to be, a substitute for professional medical advice, diagnosis, or treatment and should never be relied upon for specific medical advice. The views expressed in this article are the views of the expert and do not necessarily represent the views of Healf