Sleep problems are often described as the “hallmark symptom” of post-traumatic stress
disorder (PTSD). Patients with PTSD are often deficient in the ability to retain and
recall extinction memories relative to those without PTSD. Because memory consolidation
is strongly influenced by sleep, we hypothesized that re-entrainment of sleep and
circadian rhythms via daily morning exposure to blue-wavelength light would enhance
consolidation and retention of learned extinction memories following fear conditioning
in patients with PTSD.
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