The Short Version
This claim is not supported by the available evidence. Mainstream sleep medicine — including CBT-I stimulus control protocols and guidance from Harvard Health, the Cleveland Clinic, and the American Academy of Sleep Medicine — explicitly recommends reserving the bed for sleep (and sex) only, warning that in-bed activities like reading or journaling can condition wakefulness and worsen sleep quality. No rigorous study in the evidence base compares "bedtime stacking" in bed against a bed-only-for-sleep approach and finds it superior.