Settle in for a journey into deep relaxation with archive BBC recordings of the ocean waves and sea sounds, alongside weather ...

Maybe you even use pink noise, like the gentle crash of ocean waves against the shore, to get to sleep. But there's another frequency to try: brown noise, also called Brownian noise or red noise ...

An iPhone user has shared a 'most useful' tip to access a 'hidden' sound machine feature on her mobile - and people are now praising the hack as perfect for sleep and relaxation.