Even when you’re desperate for some rest, sleep doesn’t always come. Pzizz Pro is an app that uses soothing sounds to help you doze off at night. It can even help you power nap during the day. You can get a three-year subscription now for $49.99 at 9to5Toys Specials.

In the same way that lullabies can send your kids to sleep, Pzizz aims to calm your brain with gentle music and the sounds of nature. All the tracks are created by human composers, but the app then creates a custom mix to suit your ears. In addition, you can choose to listen to a voiceover — this works on the same principle as sleep hypnosis. Pzizz Pro works offline, and you can listen continuously for up to 24 hours at a time.

Many users get to sleep more quickly, and wake up feeling more refreshed. Even folks who suffer with insomnia and PTSD often benefit. What’s more, the app gets better over time.

Worth $299.99, three-year subscriptions to Pzizz Pro are now just $49.99.