Light in Frail Elderly - the Effect of a Dynamic Light for Sleep and Circadian Rhythm

This study tests whether dynamic lighting — light that changes in brightness and color throughout the day to mimic natural sunlight patterns — improves sleep quality and circadian rhythm (internal body clock) in elderly patients admitted to hospital. Participants have their sleep patterns tracked while in specially equipped hospital rooms. You may be eligible if: • You are 65 years of age or older • You are admitted to one of the designated study rooms in the participating hospital You may NOT be eligible if: • You have taken an overdose of an addictive substance • You have an acute neurological condition • You are currently taking melatonin • Your expected survival is less than 5 days • You have severe visual impairment that makes reading impossible • You are unable to understand spoken or written Swedish • You take medications for Parkinson's disease, neuroleptics, lithium, or dementia drugs Talk to your doctor to see if this trial is right for you.