Early Cognitive Behavioral Therapy for Insomnia (CBT-I) in People Planning to Under Hematopoietic Stem Cell Transplant (HSCT)

Inclusion Criteria:

* ≥18 years old
* ≥10 on Insomnia Severity Index
* Primary HSCT physician approval
* English speaking

Exclusion Criteria:

* Known untreated sleep disorder (such as sleep apnea or restless legs syndrome)
* \>3 on STOP BANG indicating increased risk of sleep apnea
* Increased risk of Restless legs syndrome as determined by RLS-Diagnosis Index
* Parasomnia as determined by the Sleep Disorders-Revised
* If taking benzodiazepines, non-benzodiazepines, or melatonin supplements or agonists for insomnia, taking \< 3 months or dose has changed in past 3 months
* T-score ≥70 on PROMIS 29+2 Anxiety or PROMIS 29+2 Depression domains indicating moderate/severe anxiety or depression
* Current or history (up to 2 years) of substance use disorder involving drugs or alcohol as defined by DSM-5-TR criteria
* History of other nervous system disorder such as stroke or Parkinson's disease
* Severe mental illness such as schizophrenia or bipolar disorder
* Severe neurological or sensory impairments that would interfere significantly with testing
* History of (within 5 years) or currently conducting overnight shift work including hours of midnight-4am
* Currently receiving a behavioral sleep health intervention or other behavioral health interventions that may impact sleep (such as exercise, mindfulness, CBT)