I fell back asleep fast at 3 a.m. using a brain researcher’s 5-minute trick — here’s why it works

I went through a period of waking up at 3 a.m. most nights and it felt nearly impossible to fall asleep again. I tried everything from breath techniques designed to calm my nervous system, to getting out of bed and 'pottering' in another room, but nothing worked.

After repeated 3 a.m. wake-ups that were draining me of energy the next day, I decided to get to the bottom of not only why I was waking up at 3.a.m, but how to fall asleep fast again in the middle of the night.

After speaking with experts, I learned that stress (oh hello, cortisol) and anxiety were behind my disrupted sleep. I also discovered a simple relaxation technique that can now help me fall asleep in two to five minutes whenever I wake up at night. Here a psychotherapist explains why it works and how.

Key take-aways: At a glance

• The 3 a.m. wake-up fix: Cognitive shuffling is a mental exercise designed by cognitive scientist Dr. Luc P. Beaudoin to stop racing or busy thoughts that keep you awake at night.
• The 'brain-flip': Cognitive shuffling flips your brain into a 'pre-sleep' state by mimicking the random imagery we experience right before drifting off, and is a science-backed way to fall asleep fast again if you wake up at 3 a.m.
• Anti-stress mode: By focusing on random images and words, you trigger your parasympathetic nervous system responsible for your 'rest and digest' state.
• A faster way to fall back asleep: Just two to five minutes of shuffling through a few letters of the alphabet should be enough to help you drift back into a state of deep rest.

How stress causes 3 a.m. wake-ups

Our sleep is primarily controlled by two main hormones: cortisol and melatonin. These help regulate our internal body clock (also known as circadian rhythm), which determines when we feel awake and when we feel sleepy.

Cortisol, the energizing hormone, is usually released at about 3 a.m. and onwards to help our bodies slowly wake to the day. Melatonin, on the other hand, is released in response to darkness, so is usually released in the evening to help us fall asleep at the right time.

However, cortisol is also a stress hormone. This means that if you experience high levels of stress and anxiety, your cortisol levels are likely to be higher throughout the night. So, when more cortisol is released at about 3 a.m., it’s enough to wake you up abruptly.

This is called the cortisol awakening response (CAR). And it often goes hand-in-hand with a fast heart and racing thoughts, making it difficult to fall back asleep.

Juggling studies, full-time work and two new kittens, this seemed like the culprit behind my disrupted sleep schedule.

While I needed to work at relaxing during the day and implementing a stress-reducing nighttime routine, I also needed an effective short-term technique to make sure I could fall back asleep in the middle of the night.

The technique I used to fall back asleep fast at 3 a.m

What is ‘cognitive shuffling’?

When I learnt about ‘cognitive shuffling,’ a technique developed by Canadian cognitive scientist Dr. Luc P. Beaudoin, I was surprised at its simplicity.

“Cognitive shuffling is a technique where you deliberately think about random, unrelated things, like a lamp, a banana and a car in quick succession,” explains Amy Morin, a Psychotherapist and author of The Mental Strength Playbook.

“The idea is to mimic the kind of loose thinking your brain naturally does as it drifts toward sleep,” she adds.

This essentially ‘tricks’ your brain into sleep mode, “giving it meaningless content to process instead of worrying about the problems that keep you awake,” Morin explains.

How to try ‘cognitive shuffling’

Sometimes, the pressure of thinking of random objects that aren’t connected can actually make your brain work too hard and wake you up.

So a good way to practise cognitive shuffling is to think of a word and then think of objects beginning with each letter of that word.

For example:

Mall, manatee, mug, map…

Ant, apple, attic…

Top, tail, tick…

Trainers, tickle, table…

Rain, rabbit, ruby…

Eggs, elephant, ears…

Sausage, socks, seat…

Switch, store, scissors…

As you can imagine, you don’t need any fancy equipment or lots of focus. It’s quick, free and simple – and surprisingly effective.

My experience of falling back asleep fast at 3 a.m.

With low expectations, I tried this method after lying awake for 20 minutes in the early hours. I closed my eyes and thought of the word ‘sleep’, visualizing random objects that started with each letter of the word.

Initially, my brain started connecting the images, rationalizing them and giving them reason and logic.

But when this happened, I simply stopped and started again. Soon, my thoughts weren’t making any sense, and I drifted back to sleep, calm and anxiety-free.

I was shocked at how effective it was, and when I implemented it again the next night, I fell back asleep in under five minutes.

I also found it was the perfect solution for distracting my anxious brain. Breathing methods gave me too much time to think and become more stressed, whereas this kept my brain away from stressful to-do lists.

And the more you practise, the easier it gets — so now cognitive shuffling is my go-to fall asleep fast method.

More tips to fall asleep quickly again at 3 am

If cognitive shuffling isn’t for you, there are some effective alternative methods I’ve tried. These are the top three:

1. Use an eyemask and earplugs: To stop your brain from becoming too stimulated and switching on, an eyemask and earplugs can keep external stimuli away, helping you drift off in silence and darkness. It also stops you from looking at the clock — a classic stress-inducer.
2. Try slow breathing: Rather than focusing on complicated breathing techniques that usually make me feel more anxious, I just try to slow my breathing down. I don’t restrict myself or count my breaths, but just ensure I’m taking deep, slow breaths. This is usually enough to stimulate my parasympathetic nervous system (for rest and digest) rather than my sympathetic (for fight or flight).
3. Listen to a podcast: Sometimes, if the anxiety is too much for any other method, distracting my brain by listening to a quiet podcast I’ve listened to before can help. It distracts my brain enough from my stressful thoughts, but not enough to actually stimulate me and keep me awake. A calming voice is always a bonus!