If your brain insists on replaying every awkward moment you've ever lived through the moment your head hits the pillow - you're not alone.

And now, an emergency room doctor is offering a surprisingly simple technique that could help calm those spiralling late-night thoughts.

Dr Joe Whittington, an emergency medicine physician from the US, explained a method known as the 'Infinity Tracing Technique'. 

It's a tool commonly used in therapy and neuroscience to settle overactive minds, and according to Dr Whittington, it works a little like 'distracting a toddler with a shiny object - except the toddler is your brain.'

'Brain won't shut up at night? Do you ever lay in bed at night overthinking all of the embarrassing things you've done since childhood? Same,' he said. 

'I'm going to teach you a technique that might help you calm your overactive brain... Try this weird but effective trick to calm racing thoughts and actually fall asleep.'

Here's how it works: raise your finger in the air, and slowly trace the shape of an infinity symbol.

'What you do is you take your finger, put it in the air and you trace the infinity symbol slowly and methodically,' Dr Whittington explained. 

However, he pointed out you should not move your finger around quickly 'like you're casting spells.

As you're tracing the infinity symbol with your finger, he said the key is to move slowly and use only your eyes to follow the shape.

According to Dr Whittington, this movement activates the brain's vestibular system - the part responsible for balance and eye motion.

Engaging that system can help interrupt racing thoughts and regulate the nervous system, easing you into a calmer headspace.

The neurological trick won't erase the memories of that time you replied 'you too' when the waiter told you to enjoy your meal - but it can help you stop spiralling about it in the middle of the night.

While the method isn't a replacement for professional support, many praised Dr Whittington's advice as a helpful, accessible tool to ease the nightly onslaught of overthinking. 

'I need this all day every day. Thanks Doc,' one said. 

'I'm an obsessive overthinker, where it makes me sick to my stomach. Cross fingers this works,' another added. 

'Wow I needed this,' one shared. 

Those who tried the technique confirmed they were able to fall asleep, with one saying: 'It worked for me.'

Elsewhere in the comments, people across all ages shared their own struggles with nighttime anxiety - and a few of their own coping techniques.

'Yes, this happens to me every night and I'm 52. That's a lot of years to think about everything,' one woman wrote.

'I count backwards by threes. Keeps the brain busy. Works every time,' another added.

One person said they'd unknowingly been using a similar trick for years.

'Didn't realise why I did this... but makes sense. I always draw a shape like a five-petal flower, all in one line, sort of like a spirograph, and it calms me down.'