Paul Walter Hauser Dark (voice)
Colin Hanks Adult Orion (voice)
Carla Gugino Orion's Mom (voice)
Angela Bassett Sweet Dreams (voice)
Jacob Tremblay Orion (voice)
Werner Herzog Narrator (voice)
Ike Barinholtz Light (voice)
Golda Rosheuvel Unexplained Noises (voice)
Charlie Kaufman Writer
Nat Faxon Insomnia (voice)
Amy Hill Irene (voice)
Natasia Demetriou Sleep (voice)
Jack Fisher Richie Panici (voice)
Aparna Nancherla Quiet (voice)
Walt Dohrn Executive Producer, Stray Cat / Insomnia Guy 2 (voice)
Shannon Chan-Kent Adult Hypatia (voice)
Ania O'Hare Casting
Kent Osborne Story Artist
Brandon Proctor Sound Re-Recording Mixer
Ren Hanami Adult Sally (voice)
Benjamin Plessala Additional Voices (Voice)
Aliki Theofilopoulos Irene's Coworker / Mom / Juice Box / Insomnia Teacher (voice)
Sean Charmatz Irene's Boss / Cucumber Dentist / Soda / Insomnia Guy 1 (voice), Director
Hira Ambrosino Woman at the Drive-In (voice)
Nik Ranieri Supervising Animator
Joe Pitt Character Designer
Steve Slanec Supervising Sound Editor
Matt Dellapina Orion's Dad (voice)
Jason Oliver Dialogue Editor
M. Scott McKee Visual Effects Supervisor
Lloyd Taylor Additional Writing
Brandon Sawyer Additional Writing
Matthew Festle Sound Editor, Sound Effects
Nick Kishiyama Tycho (voice)
Andy Schuhler Visual Development
Nathan Nance Sound Re-Recording Mixer
Laura Macias Foley Artist
Shawn Krause Supervising Animator
Bonnie Arnold Executive Producer
Sky Alexis Lisa (voice)
Nico Marlet Character Designer
Tom Caulfield Story Artist
Kaan Kalyon Story Artist
Tim Nielsen Sound Designer, Sound Re-Recording Mixer, Supervising Sound Editor
Matthew Bordenave Story Artist
Adam Rosette Head of Story
Ashley Laidlaw Line Producer
Johane Matte Story Artist
Catherine Yuh Rader Story Artist
Vivian Aguiar-Buff Music
Ryan Munk CG Supervisor
Vincent Deng Foley Artist
Jon Magram Story Artist
Guillaume Fesquet Visual Development
Candice Ray Production Manager
Killian Gray Production Manager
Timothy Lamb Production Designer, Character Designer
Julien Bocabeille Animation
Ruben Perez Visual Development
Rubul Das Animation Supervisor
Brent Tyler VFX Supervisor
Justin Ridge Story Artist
Rob McIntyre Supervising Sound Editor
Bruno Etchepare Animation
Kevin Turcotte Matte Painter
Toru Uchikado Insomnia Man (voice)
Belal Ballout Rigging Supervisor
Eric Elrod Story Artist
Ian Michael Hurley Online Editor
Ernest Chan Animation Supervisor
Steven Tarin Modelling Supervisor
Robert Lydecker Original Music Composer