1. Tapping

    Fingertips and nails on wood, plastic and metal. Four to try below, and why the material changes how tapping feels.

    26 in the app
  2. Scratching

    Slower and grittier than tapping: nails dragged across the mic, foam, leather and wood. Four to try below.

    14 in the app
  3. Crinkling

    Plastic, paper and foam, crumpled close to the mic. Some people get strong tingles from it and others feel nothing. Four to try below.

    18 in the app
  4. Brushing

    Soft brushes on the microphone, fur and foam. One of the gentlest triggers, and an easy one to fall asleep to. Four to try below.

    14 in the app
  5. Mouth sounds and whispers

    Whispers, breathing, humming and eating sounds: the triggers people love most, and the ones some people can't stand. Four to try below.

    37 in the app
  6. Ear cleaning and personal care

    Ear cleaning, cotton swabs and massage, recorded as if someone were looking after you. Four to try below.

    18 in the app
  7. Objects

    Singing bowls, tuning forks, clocks and beads: sounds made by handling things. Four to try below.

    27 in the app
  8. Rain, nature and ambience

    Rain, thunder, waves and wind. They don't always bring tingles, but most people find them easy to sleep to. Four to try below.

    42 in the app
  9. White, pink and brown noise

    White, pink and brown noise, and a fan. What each one is, which to pick, and four to try below.

    15 in the app
  10. Study and focus

    Keyboards, pens and pages: the sound of someone else working, which helps some people get on with their own. Four to try below.

    16 in the app

Want to layer them into a mix and play them all night? That's what the app is for. It's free on iOS and Android.