Time-in-bed Restriction in Older Adults With Sleep Difficulties With and Without Risk for Alzheimer's Disease

Participants will undergo a 4-week sleep intervention that includes specified in- and out-of-bed times as well as a restriction to their habitual time in bed (average sleep opportunity including naps). This will be truncated equally at the beginning and end of the night.

Participants will maintain their typical sleep schedule for 4-weeks.