It's called biphasic sleep for people that want to read up on it. > My guess, this sleep pattern is better for learning. That might be true. One of the techni

It's called biphasic sleep for people that want to read up on it. > My guess, this sleep pattern is better for learning. That might be true. One of the techniques to induce lucid dreaming works similarly – sleep for 4-5 hours, wake up, stay awake for 15-60mins then go back to sleep. It's called "wake back to bed" technique. Many lucid dreamers report increased capacity for learning in dreams.