According to recent research published in ‘Alzheimer's & Dementia’, delays in entering the rapid eye movement (REM) sleep phase may signal early signs of Alzheimer's disease. The study found that people who take significantly longer to enter REM sleep, a phase critical for memory processing, might experience early symptoms of Alzheimer's. REM sleep helps consolidate memories, especially emotionally charged ones, and disruptions in this process can impair brain function, potentially leading to cognitive decline. Researchers studied 128 individuals with an average age of 70, including those with Alzheimer's and mild cognitive impairment (a precursor to Alzheimer's). The study found that people with delayed REM sleep had higher levels of amyloid and tau proteins, which are associated with Alzheimer's. Additionally, they had lower levels of brain-derived neurotrophic factor (BDNF), a protein that supports brain health. Those who entered REM sleep earlier had more favorable brain health markers. Although the study didn’t establish a cause-and-effect relationship, it suggests that delayed REM sleep might be an early indicator of Alzheimer’s or could contribute to its development. Previous research has linked poor sleep to an increased risk of Alzheimer's, and treatments like melatonin and certain sleep medications have been shown to reduce amyloid and tau levels. Researchers recommend good sleep hygiene as a preventive measure, such as addressing conditions like sleep apnea and avoiding heavy drinking, which can interfere with sleep. Those on medications affecting REM sleep should consult with their doctor about potential risks.