| Annalee |
Ahlberg | Missing; Lianna's mother; sleepwalker. |
| Lianna |
Ahlberg | Annalee's daughter; narrator and protagonist. |
| Paige |
Ahlberg | Lianna's sister. |
| Warren |
Ahlberg | Lianna's father. |
| Timothy |
Brueggeman | Sleepwalker who freezes to death. |
| Justin |
Bryce | Firefighter. |
| Justin |
Bryce | Marilyn's husband. |
| Marilyn |
Bryce | Annalee's friend. |
| Paul |
Bryce | Marilyn's son. |
| Bill |
Caldwell | Emily's husband. |
| Emily |
Caldwell | Annalee's friend. |
| Elen |
Cooper | Lianna's high-school friend. |
| Ellen |
Cooper | Lianna's friend. |
| Katherine |
Edwards | Minister. |
| Jasmine |
Foster | One of the kids at the party. |
| Stewart |
Godwin | Lianna's high-school boyfriend. |
| Donnie |
Hempstead | First responder. |
| Carol |
McClellan | Ahlbergs' next-door neighbor. |
| Lindsay |
McCurdy | Successful performer. Aka: Rowland the Rogue. |
| Coach |
Noggler | Swimming coach. |
| Kenneth |
Parks | Man who kills while sleepwalking. |
| Heather |
Prescott | Lianna's friend. |
| Zach |
Prescott | Heather's brother. |
| Gavin |
Rikert | Detective who knew Annalee; sleepwalker. |
| Elliot |
Sheldon | First responder. |
| Kenny |
Sheldon | Paige's schoolmate. |
| Sally |
Sheldon | Elliot's niece. |
| Melissa |
Toms | Sleep sex-walker. |
| Cindy |
Yager | Runs the sleep center. |
| Arvid |
| Annalee's uncle. |
| Carl |
| Documentary filmmaker; Lianna's ex-boyfriend. |
| Dakota |
| Student who brought fan of neon-yellow ash. |
| David |
| Boy Lianna likes. |
| Donna |
| School principal. |
| Erica |
| Lianna's college friend. |
| Erica |
| Lianna's college roommate. |
| Hailey |
| High-school teacher. |
| Jennifer |
| Paige's schoolmate. |
| Joe |
| The barn cat. |
| Julie |
| Rikert's niece. |
| Lola |
| A yellow dog. |
| Lucy |
| Lianna's co-swimmer. |
| Manholt |
| Annalee's father. |
| Max |
| K-9 dog. |
| Peggy |
| Woman who made Mexican wraps. |
| Samantha |
| Warren's student. |
| Tucker |
| K-9 dog. |
