Finnish musician and sound artist Olli Aarni released Haalea last year on Longform Editions. Describing the piece, Olli says: "It's me reflecting my worst sleeping habits, when I went to sleep too late and then I wake up to this beautiful day but I feel it's too early for me. The sun is shining and it's a kind of piercing sunshine that wakes you up in this almost violent way, but when you open your eyes it's not too bad. You're on the verge of if you should go back to sleep, or if you should go and enjoy the day."

In this episode of SleepTalker, Olli talks to Bec about his ongoing hypnogogic and pareidolic preoccupations, and how he composes longform sounds to accompany sleep — including the "sleep test", where if a piece of music wakes Olli from a studio nap, it's not yet ready. Olli also explains an earlier piece, Lumpeenkukka, a generative synthesiser composition that's a "dreamy, echoey, always-morphing pattern" based on a phone alarm sound.

Find out more about Olli's work at his website or follow him on Twitter.