I wish it were the ocean making this sound, or some other non-electronic, natural & soothing element, but alas, it is not. It is the sound of a Dohm White Noise machine… effectively made & sold (by the thousands) by Marpac in partnership with The National Sleep Foundation.
If you think it ridiculous that I am sharing such information, think again. This sucker has been a LIFE CHANGER.
Read more about it over here.