Nurse-Led Elderly Sleep Intervention

European Quality of Life 5 Dimensions (EQ-5D) will be used. Maximum score: 100, representing "best possible health." Minimum score: 0, representing "worst possible health."

The CogniFit® computerized battery for smart devices is used for neurocognitive assessment and training of various cognitive functions, such as memory, attention, planning, processing speed, and cognitive flexibility. The CogniFit® neurocognitive assessment uses a series of interactive tasks and exercises to measure the status of different cognitive domains, providing detailed quantitative and graphical results that allow for the identification of strengths and areas for improvement. It has been previously validated in older adults, demonstrating good internal consistency (Cronbach's alpha = 0.85-0.88) and test-retest reliability (r = 0.69-0.92). The neurological assessment provides an overall score expressed in normative scores compared to similar populations, facilitating its interpretation in both clinical and research contexts. In addition, it offers cognitive training exercises.

Questionnaire on sociodemographic variables of own elaboration will be used for the collection of sociodemographic, anthropometric and health and drug-related data.

The Katz Index, will be used to assess the level of independence of older adults in performing Basic Activities of Daily Living (BADLs). This instrument measures functional capacity in essential daily living tasks, providing an objective view of the level of dependence or autonomy of the person being evaluated. The index assesses six basic functions: bathing, dressing, toileting, mobility, continence, and feeding. (6) points: Independent in all activities. (0) points: Dependent in all activities.

The Lawton and Brody scale will be used to assess functional capacity in Instrumental Activities of Daily Living (IADLs), which are more complex tasks than basic activities and require more advanced cognitive and physical skills.

0 points: Total dependence. 8 points: Total independence (for women, and 5 for men).

The Lubben Social Network Scale (LSCS) will be used to assess the level of social support and social network of older adults. It consists of six items scored on a 0-to-5 Likert scale. Higher scores reflect larger social networks and greater availability of social support. Conversely, scores below indicate a high risk of social isolation.

Yesavage Geriatric Depression Scale will be used. Consists of 15 dichotomous (yes/no) questions, in which each item is scored 0 or 1 depending on the response.

0-5 points: Normal. 6-9 points: Mild depression. > 10 points: Established depression.

The Timed Up and Go (TUG) test will be used to assess balance, mobility, and fall risk in older adults. The test involves recording the time it takes a person to perform the following tasks: stand up from a chair with armrests, walk a distance of 3 meters marked on the floor, turn around, return to the chair, and sit down again. The total time is measured in seconds using a stopwatch. According to the standards, a time of less than 10 seconds indicates excellent mobility, while times greater than 20 seconds suggest limited mobility and a higher risk of falls.

The Memory Failures of Everyday (MFE) questionnaire will be used to assess everyday memory lapses. It consists of 28 items and is answered using a three-point Likert scale (Montejo et al. version) ranging from 'never in the last three months' to 'more than once a day'. Lower scores indicate fewer lapses, while higher scores indicate more lapses.

Lobo Mini-Mental State Examination (36-item version) will be used to assess cognitive impairment associated with neurodegenerative diseases. It consists of several items that evaluate five cognitive domains: memory, orientation, attention span, calculation, concentration, and language. In geriatric patients over 65 years of age, scores below 23 are considered indicative of cognitive impairment; in patients under 65 years of age, scores of 27 or below are considered indicative of cognitive impairment.