This study is looking at a dietary supplement called citicoline to see if it helps with sleep and thinking skills in people with mild cognitive impairment (MCI). MCI means having more trouble with memory and thinking than normal for one's age. The researchers also want to see if citicoline affects substances in the body linked to Alzheimer's disease, like biomarkers—which are like tiny clues in the body showing how healthy it is. The study will include people aged 60 and older who have MCI, can read English, and have internet access. People who have certain health conditions or take certain medications cannot join. The study will involve a random selection where neither the participant nor the researcher knows if they are getting citicoline or a placebo (a pill with no active ingredient).

• The study will take place at Emory Sleep Center and other research centers.
• Participants will have some tests done, like blood tests, to check their health markers.
• This is a pilot trial, meaning it's a small, early study to see if citicoline is worth studying further.