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Pen name · Kalderno

For people who think too much at 3 AM.

Plain, funny, practical help for overthinkers, from a fellow overthinker who is not a therapist.

Meet Shut Up, Brain Get the free 3 AM Kit

Mariah Renner is a pen name published by Kalderno.

Front cover of Shut Up, Brain: How to Stop Overthinking, Quiet the 3 AM Spiral and Finally Trust Yourself

For most of my life, I was a champion overthinker.

From the introduction of Shut Up, Brain

The book

Secret Self Care, Book 1 · Audiobook

Shut Up, Brain

How to Stop Overthinking, Quiet the 3 AM Spiral and Finally Trust Yourself

The three steps: turn the alarm down a notch, name the loop, decide or drop. Plus the 3 AM Spiral Breaker, a bedtime routine you can follow in the dark, the worry slot, and a plan for "Are they mad at me?" Not a promise of a silent brain. Nobody has one.

Audiobook with a printable companion kit

Explore the audiobook

Free from the book

Two free companions on Kalderno. No sign-up, no email.

The overthinking quiz

A short quiz from Shut Up, Brain that runs in your browser. Nothing you answer leaves your device.

Take the quiz

The 3 AM Kit

A six-minute reset audio, a tracker for nights 15 to 30 and lock-screen wallpapers with the three steps on them.

Open the kit

Lines from the book

  • Decide or drop.
  • It'll keep until morning.
  • Starting again is the skill.
  • Some things are very loyal.
  • Turn the alarm down a notch.
A phone in a sage green case on a wooden table plays the Shut Up, Brain audiobook, next to an iced matcha and an open earbuds case.
A laptop on a knitted blanket by a rainy window shows the Shut Up, Brain audiobook page, an iced matcha on the side table.
At night in bed, a hand holds a phone that plays chapter 2 of Shut Up, Brain with a sleep timer set, an earbuds case on the blanket.

About Mariah

Mariah Renner writes for the version of you that is still awake, replaying something you said at dinner. Her voice is dry, kind and practical: one joke, one tool, no lecture.

Shut Up, Brain is the first book in her Secret Self Care series. It starts with the body, not the thought, because you cannot argue a thought into lying down. Book 2 is on its way.

Mariah Renner is a pen name published by Kalderno.

What you will not find here

  • Not a therapistMariah is not a therapist or a doctor. The book is a friend's toolkit, not treatment and not a diagnosis.
  • No silent brainNobody has one. The book is about knowing what to do when the alarm goes off.
  • No invented storiesThe people in the book are composites. There are no follower stories or reviews on this page.

Good to know

Before you listen

  • Seen on TikTok

    Lines from Shut Up, Brain show up in short TikTok videos. If one of them found you at the right moment, this is where it comes from.

  • Free means free

    The quiz and the 3 AM Kit cost nothing and ask for nothing. No email, no account.

  • Published by Kalderno

    An independent publisher in Limassol, Cyprus. The imprint and contact details are linked at the bottom of this page.

  • Nothing tracked

    This site sets no cookies and runs no tracking. The quiz keeps your answers on your own device.

If you feel unsafe right now: call or text 988 in the US, or call 911. Anywhere else, findahelpline.com lists a free line near you.

Questions

Who is Mariah Renner?

Mariah Renner is a pen name published by Kalderno. She writes plain, practical help for overthinkers, starting with the audiobook Shut Up, Brain, book 1 of the Secret Self Care series.

Is Mariah Renner a therapist?

No. Mariah Renner is not a therapist or a doctor, and Shut Up, Brain is self-help, not treatment. If you feel unsafe, call or text 988 in the US, or find a free line near you at findahelpline.com.

Where can I listen to Shut Up, Brain?

Shut Up, Brain is an audiobook. Its book page on this site has the current listening link.

Are the quiz and the 3 AM Kit really free?

Yes. Both are free, need no sign-up and never ask for an email address.

Is there a second book?

Yes, book 2 of Secret Self Care is on its way. Shut Up, Brain is book 1.