Jacob Tremblay

Orion (voice)

Paul Walter Hauser

Dark (voice)

Angela Bassett

Sweet Dreams (voice)

Colin Hanks

Adult Orion (voice)

Natasia Demetriou

Sleep (voice)

Golda Rosheuvel

Unexplained Noises (voice)

Nat Faxon

Insomnia (voice)

Aparna Nancherla

Quiet (voice)

Ike Barinholtz

Light (voice)

Carla Gugino

Orion's Mom (voice)

Matt Dellapina

Orion's Dad (voice)

Nick Kishiyama

Tycho (voice)

Mia Akemi Brown

Hypatia (voice)

Shannon Chan-Kent

Adult Hypatia (voice)

Jack Fisher

Richie Panici (voice)

Werner Herzog

Narrator (voice)

Sky Alexis

Lisa (voice)

Hira Ambrosino

Woman at the Drive-In (voice)

Yoshi Ando

Man at the Drive-In (voice)

Larisa Asuaje

Mrs. Spinoza (voice)

Sean Charmatz

Irene's Boss / Cucumber Dentist / Soda / Insomnia Guy 1 (voice)

Walt Dohrn

Stray Cat / Insomnia Guy 2 (voice)

Ren Hanami

Adult Sally (voice)

Amy Hill

Irene (voice)

Alyssa Lee

Irene's Daughter / Insomnia Girl (voice)

Noah McCown

Scared Child (voice)

Shino Nakamichi

Sally (voice)

Aliki Theofilopoulos

Irene's Coworker / Mom / Juice Box / Insomnia Teacher (voice)

Toru Uchikado

Insomnia Man (voice)