TONS of Intermediate to Advanced CI content at Calm.com

Calm.com has 253 "sleep stories" (if I counted correctly) that are each 20 to 72 minutes long and read at a nice, gentle pace, and 44 of those stories are designed for children. I'd guess there's over 150 hours of content from these stories alone.

Here's just a sample.

There's also guided meditation that cover different focuses like concentration, relationships, work, sleep, and others. Each category has varying amount of guided meditations and usually last 5 to 20 minutes. Lastly, there's a new daily meditation every day that is around 10 minutes.

Each of these are a series of mediations in the Concentration category.

Calm.com also has content in English, French, Dutch, Italian, Polish, Portuguese, Japanese, and Korean.