NCT02502045.

Methods	RCT
Participants	Inclusion criteria: baseline sleep efficiency index < 0.85 Mini‐Mental State Examination‐2 Standard Version score 0–20 medically stable Exclusion criteria: received light treatment in last 3 months totally blind in both eyes; have photosensitivity or photophobia, Parkinson's disease, known untreated sleep apnoea or other sleep disorders, seizure disorder, bipolar, or schizophrenia; actively receiving chemotherapy or radiotherapy for cancer
Interventions	Device: morning simulated sunlight (Philips Wake Up Light, Model HF3520) peaking at 300 lux delivered over a 40‐minute ramp between 5 a.m. and 9 a.m. for 14 consecutive days Device: non‐therapeutic red light control at 5 lux
Outcomes	Change in sleep characteristics and rest–activity rhythm
Notes	Awaiting response from author.