There are eight sounds to choose from which allows you to experiment and find which one works best: Waves, birdsong, rain, car journey, spaceship, white noise, pink noise and brown noise.

For the majority of testing, I set it to shift when falling asleep and typically woke to my favored rain sound without problems. Sleep data tracking and environmental sensing of temperature ...

There’s a growing buzz around pink noise, brown noise, green noise – a rainbow of soothing sounds – and their theoretical effects on sleep ... the natural sound of rain or the ocean.