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)

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)

Sean Charmatz

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

Walt Dohrn

Stray Cat / Insomnia Guy 2 (voice)

Amy Hill

Irene (voice)