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Built for one person. Now for everyone.

A letter from Roman Fritschi: “I built Baku for my wife.”

Hi, I’m Roman.

For a long time, my wife woke up from a nightmare almost every night. Often the same dream, often at the same hour. I woke up too, and lay next to her in the dark, not knowing how to help.

The nights didn’t stay in the night. They followed her into the day: tired mornings, a heaviness that sat on everything, and a quiet dread as bedtime came closer.

I went looking for something that would actually help. I found sleep trackers that gave the night a score, dream dictionaries that made dreams sound like warnings, and meditation apps that were lovely in the evening and had nothing to say at 3 a.m.

Then I found imagery rehearsal. It isn’t new and it isn’t mine. Sleep medicine has recommended it for years: choose a nightmare, change the story while you are awake, and rehearse the new version for a few minutes a day. It is simple and gentle, and almost nobody gets to use it, because it has never been made for real life. For a tired person. In the dark. At 3 a.m.

The more I read, the more I noticed something else. People have done a version of this for thousands of years. Jewish, Christian and Islamic traditions and the healing temples of ancient Greece all had rituals for the evening, words for the night and ways to set a bad dream down in the morning. Old wisdom and new science were pointing the same way.

So I built Baku for her. A home screen that follows the sky. Nightlight, a warm one-tap mode for the hour you need it, free forever. A rewrite studio that never asks you to relive the whole dream. The voice of someone who loves you, recorded in daylight for the night.

I named it after the baku, the gentle creature from Japanese folklore that people asked to take their bad dreams away. Ours keeps watch.

Everything in Baku is based on methods that research shows can reduce nightmares. Where the evidence is thin, we say so. We will never tell you what your dreams predict, never show you an ad, and never sell your nights.

It started as something for one person. Now it is for anyone who dreads the night. I hope yours get quieter. Ours are starting to.

Roman FritschiFounder

The idea

Old wisdom, new science.

Baku is built on one observation: sleep science and very old traditions point the same way. Imagery rehearsal, the approach the American Academy of Sleep Medicine recommends for nightmare disorder, asks you to change a nightmare’s story while awake and rehearse the new ending. For thousands of years, people have closed the day with a ritual, spoken words into the night and set bad dreams down in the morning. Baku packages both into a calm routine a tired person can actually use: rewrite in the day, wind down in the evening, and one tap of warm light at 3 a.m.

From one home to everyone.

  1. At home

    The nights at home

    “My wife woke from a nightmare almost every night,” Roman says, “and the nights followed her into the day.”

  2. The search

    Finding imagery rehearsal

    Trackers, dream dictionaries and meditation apps, then the method sleep medicine has recommended for years.

  3. For her

    Building it for her

    A rewrite studio, a warm light for 3 a.m., a loved one’s voice for the night, and the old practices beside the science.

  4. October 2026

    Open to everyone

    Baku opens for iPhone and Android, in English and German.

The name

Why Baku?

In Japanese folklore, the baku is a gentle creature that people called on to take their bad dreams away. Children were told that if they woke from a nightmare, they could ask the baku to carry it off.

Our baku keeps watch. The crescent in the b of our name is the same shape as the moon on the app icon: the night, in one letter.

What we promise.

Help at night is free

Nightlight, the 3 a.m. mode, is free forever and never asks you to sign in.

No ads, ever

We earn money from Plus subscriptions only. We never sell or share data for marketing.

Your dreams are yours

Private by default, exportable, and deleted for good when you ask.

Proof, not promises

Every claim has a source. We share our own results only once we have measured them.

For anyone who wakes at 3 a.m.

Give your nightmares to Baku.

Rewrite the dreams that keep coming back, and keep a quiet, warm light for 3 a.m. Coming to iPhone and Android.

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