Just stayed in a hotel that had a Dohm sounds machine. I’d never seen one before, but it did a great job (along with ear plugs) of drowning out traffic and hallway noise during the day. It has a fan or something that makes a steady, dull white noise. I ordered one as soon as I got up from my nap. Also got a smaller Rohm unit that works well too. I ordered the “Uno” that seems to be more cheaply made than the version the hotel had, but still works for home. I’ve tried using my phone to play sleep sounds in the past, but the looping/skipping often wakes me up. With Dohm, it’s just one long, consistent noise.