We’ve already discussed two major mechanisms of insomnia:
The first is circadian misalignment — when your body clock doesn’t know what time it is, thanks to mismanaged light exposure, irregular schedules, or social jet lag.
The second is hyperarousal, often driven by the sympathetic nervous system and the HPA axis: your body stays in a “threat assessment” mode, never fully “logging off.”
But there’s a third mechanism — less talked about, often underestimated — that plays a significant role in modern insomnia:
Conditioned arousal.
At the heart of this problem is a quiet tragedy:
You’ve trained your bed to become a place where your brain thinks… it should stay awake.
Pavlov’s Dog, Revisited
To understand conditioned arousal, we need to revisit a century-old experiment: Pavlov’s dog.
In Ivan Pavlov’s classic study, dogs would naturally salivate when fed — a built-in reflex. Then, Pavlov began ringing a bell right before each feeding. Initially, the bell had no effect. But after enough repetitions, the dogs started salivating upon hearing the bell — even when no food followed.
The bell, once a neutral cue, had become a signal: “Food is coming.”
That’s the essence of classical conditioning: a neutral stimulus, paired repeatedly with a biological state, becomes associated with that state — without any conscious thought, intention, or reasoning.
Once formed, this circuit doesn’t ask for permission. It just runs.
This matters — a lot — when it comes to understanding insomnia.
When the Bed Becomes a Wakefulness Cue
In a perfect world, the bed should trigger a low-arousal signal. The moment you lie down, your body knows: it’s time to shut down, to let go, to heal.
But what do most of us actually do in bed?
Scroll our phones. Reply to emails. Watch Netflix. Play games…
And when we finally try to sleep — but can’t — we start to stress out about not sleeping. We try to relax, try to slow our breath, try to not think… but stay wide awake.
Each of these moments — awake, alert, and trying to sleep — is a rehearsal.
You’re rehearsing being awake in bed. And repetition builds association.
Even if your wakefulness started from circadian disruption or stress arousal, the act of trying to fall asleep in bed can create a third barrier: your brain now sees the bed as a place where wakefulness happens.
Eventually, your brain builds a conditioned response:
You lie down… and it says, “Oh, I know this place. This is where we scroll TikTok and spiral about why we can’t sleep.”
So your hand reaches — almost reflexively — for your phone.
Sound familiar?
Conditional Arousal Rarely Comes Alone
These three mechanisms — circadian misalignment, sympathetic overdrive, and conditioned arousal — tend to reinforce each other:
- Hyperarousal makes you more likely to stay awake in bed.
- Circadian disruption makes it harder to fall asleep at the right time.
- The longer you’re awake in bed, the more your brain reinforces the “bed = awake” association.
But here’s the good news:
Conditioned arousal can be targeted directly.
It doesn’t require emotional work, mindfulness, or fixing your light exposure schedule.
It works by addressing one thing:
Reprogramming your association with the bed.
The CBT-I Approach: Stimulus Control
In clinical practice, this reprogramming has a name: Stimulus Control.
It’s one of the core components of CBT-I (Cognitive Behavioral Therapy for Insomnia) — currently the most evidence-based, long-term effective approach for treating chronic insomnia 3.
CBT-I consistently outperforms sleep medications in long-term trials, with five main modules: cognitive restructuring, relaxation techniques, sleep hygiene, sleep restriction, and stimulus control 5,6.
Stimulus control has a simple, powerful rule:
The bed is for sleep. And nothing else.
Only go to bed when you’re sleepy.
This isn’t a test of your willpower. It’s a way of updating your nervous system.
Here are two practical, stimulus-control-based recommendations:
1️⃣ Never Use Your Phone in Bed
Let me say it three times — because repetition builds association:
Don’t use your phone in bed. Don’t use your phone in bed. Don’t use your phone in bed.
Watch videos in the living room. Answer emails at your desk. Scroll TikTok on the couch if you must — but don’t build a neurological association between your bed and your screen.
“But I need my phone as an alarm clock!”
Buy a simple alarm clock.
“But I use it for reading, meditation, music!”
Keep a paperback book next to your bed. Use a dedicated speaker or music device for your winding-down routine.
Most of these “needs” can be addressed easily. The harder part is detaching from the addiction behind the excuses.
Even if you solve all the above, you might still hesitate to distance yourself from your phone “in case of emergencies.”
But notice what that really is: a symptom of the sympathetic nervous system’s need for control.
True sleep is the opposite of control. It’s the moment when your mind says:
“I’m off-duty. I’m OK with losing control for the next 8 hours.”
So ask yourself: how much of your bedtime phone anxiety is about real risk — and how much is just a conditioned fear of disconnection?
Just noticing that difference… is a good start.
2️⃣ If You Can’t Sleep, Leave the Bed
Whether it’s trouble falling asleep or waking up in the middle of the night, you’ve probably experienced that frustrating loop: the more you want to sleep, the harder it gets.
In fact, when you’re unable to sleep, forcing yourself to stay in bed and “try” harder can actually reinforce the conditioned association of being awake in bed.
Because what you’re rehearsing in that moment is yet another failed attempt to fall asleep.
Trying implies a goal, an evaluation, and the possibility of success or failure. And failure in this context only strengthens the brain’s association: “This bed is where I can’t fall asleep.” 3,4
So here’s a counterintuitive recommendation: If you can’t fall asleep within about 10–15 minutes, get out of bed. Don’t just lie there and endure it.
This 10–15-minute rule is an empirical guideline — not a rigid timeframe. The key is recognizing the moment when you realize: “I’m awake, I’m starting to feel anxious, I’m trying too hard to fall asleep.” That’s your signal to get up.
Of course, what you do after leaving the bed matters. The activities should align with the Winding-Down Routines described in the previous article. If you leave bed only to scroll your phone under bright lights or watch short videos, you’re not helping your sleep at all.
Instead, do something low-arousal: one of your calming winding-down routines. Wait until drowsiness returns, and then go back to bed.
This way, your bed becomes associated only with drowsiness, not wakefulness.
A Final Note
Let me be blunt: retraining conditioned responses is not easy.
In the first couple of weeks, you might feel like Pavlov’s dog 🐶 — being dragged back and forth between your bed and the living room, doubting whether any of this is working at all.
But this is precisely what a “tear down and rebuild” of your nervous system looks like.
Give your brain some time to update its version of reality. Stimulus control, based on classical conditioning theory, is the crown jewel of CBT-I. Its long-term effectiveness has been proven by extensive clinical evidence, time and again 3,4.
Once you make it through the blurry transition period, you’ll realize you’re not just fixing insomnia. You’re reclaiming control over your neural reflexes.
And when the word “bed” no longer triggers thoughts of phones, anxiety, or struggle…
The only thing standing between you and a rested, energized self is the simple act of closing your eyes.
Intervention recommendations are geared toward generally healthy individuals. If you have existing health conditions, always follow your doctor’s instructions.
References
[1]Pavlov IP. The Scientific Investigation of the Psychical Faculties or Processes in the Higher Animals. Science. 1906;24(620):613–619.
[2]Pavlov IP. Conditioned reflexes: an investigation of the physiological activity of the cerebral cortex. London: Oxford University Press (Humphrey Milford); 1927.
[3]Edinger JD, Arnedt JT, Bertisch SM, et al. Behavioral and psychological treatments for chronic insomnia disorder in adults: an American Academy of Sleep Medicine clinical practice guideline. J Clin Sleep Med. 2021 Feb;17(2):255–262.
[4]Bootzin RR. Stimulus control treatment for insomnia. Proceedings of the 80th Annual Convention of the American Psychological Association. 1972;7:395–396.
[5]Trauer JM, Qian MY, Doyle JS, Rajaratnam SMW, Cunnington D. Cognitive behavioral therapy for chronic insomnia: a systematic review and meta-analysis. Ann Intern Med. 2015 Aug;163(3):191–204.
[6]Sivertsen B, Omvik S, Pallesen S, et al. Cognitive behavioral therapy vs zopiclone for treatment of chronic primary insomnia in older adults: a randomized controlled trial. JAMA. 2006 Jun;295(24):2851–2858.
