Inclusion Criteria:

- have received a diagnosis of non-metastatic cancer (any type) in the past -18 months

- to have an ISI score > 8 or be using regularly (> 1 night per week) a psychotropic
medication as a sleep aid (e.g., hypnotic)

- to be aged between 18 and 75 years old

- to be readily able to read and understand French

Exclusion Criteria:

- having a life expectancy < 1 year

- having a severe psychiatric disorder (e.g., psychotic, substance use, severe
depressive disorder)

- having severe cognitive impairments (e.g., diagnosis of Parkinson's disease,
dementia, or Mini-Mental State Examination score < 24)

- having received a formal diagnosis for another sleep disorder (e.g., obstructive
sleep apnea, periodic limb movement disorder)

- shift work in the past 3 months or in the next 12 months

- to have received a psychological treatment specifically for a sleep disorder