White sound machine with digital display showing 23°C and 50% humidity, with various control buttons, a large dial, and the brand name 'SoundSleeper' on the front.

She wanted a white noise machine worth buying. So she built one.

Heidi's Story

Heidi Mackin founded SoundSleeper because the products she could find weren't good enough. White noise machines that just played sound. Sleep guides that recycled the same thin advice. Nothing that put both together in a way that was clinically credible and actually useful.

So she built it herself.

She asked her father, Dr James Mackin — a practising NHS GP with over 20 years in family medicine — for a simple top-ten sleep tips document to bundle with the machine she was developing.

He wrote a full evidence-based clinical guide instead.

Heidi redesigned the machine around it. They recorded the relaxation script together — her voice for the female track, Dr Mackin's for the male — so it could play directly from the device. The ebook became the intellectual foundation. The machine became its physical delivery system.

That's SoundSleeper. A real product, built by a real person, backed by genuine clinical expertise.

Heidi Mackin, founder of SoundSleeper
Dr James Mackin, NHS GP and clinical co-creator of SoundSleeper

Dr James Mackin — The Clinician

Dr Mackin is a full-time NHS GP, trained across multiple specialties including psychiatry. He encounters sleep disruption and its consequences daily in practice. His frustration was with the absence of a complete, accessible solution he could direct patients toward.

He wrote Restore Your Sleep because it didn't exist. He recorded the PMR script because the evidence for it is strong and it deserved to be heard, not just read. His name and clinical expertise are behind every SoundSleeper product.

Scrabble tiles spelling Get Good Sleep — SoundSleeper evidence-based sleep system

What We Believe

→    Sleep is not a luxury. It is a biological necessity, and most people are not getting what they need.

→    Evidence matters. Every claim SoundSleeper makes is backed by the same science Dr Mackin relies on in practice.

→    A complete solution beats a quick fix. The machine, ebook and app are designed to work together.

→    Warmth and credibility are not opposites. SoundSleeper is a family product in the truest sense.

The Brand

SoundSleeper is owned and operated by Felsted Mackins Ltd, registered in England and Wales (company no. 14269294). The machine is sold on Amazon UK and direct from this store. The ebook is available here and on all major digital platforms.

soundsleeper.org  ·  hello@soundsleeper.org  ·  @soundsleeper_uk