Vestibular Stimulation, Exercise and Light Optimization for Circadian Clock Enhancement (Velocce)

This study investigates the effects of remote interventions based on the exposure to one or more zeitgebers (i.e. adapted physical activity alone or combined with bright light exposure, or galvanic vestibular stimulation) performed several times a week during three months on older adults' sleep and quality of life.

More precisely, the main objective is to investigate the effects of interventions on objective sleep measures of older adults with a sleep complaint.

The main hypothesis is that the quantity and quality of sleep will be improved after the interventions in comparison to the active control group.

The second objective is to study the effects of these interventions on quality of life, physical condition, anxiety, depression and cognition.

Eligibility Criteria:
Inclusion Criteria:

* Healthy volunteer (men or women)
* Aged from 60 to 70 years
* Retired for at least 12 months
* Having a sleep complaint (overall score on the Pittsburgh Sleep Quality Index (PSQI) \> 5, enquire information when these complaints appeared)
* Able to receive enlightened information in French and express consent
* Having a circadian typology of the "intermediate", "moderate morning" or "moderate evening" type, according to the circadian typology questionnaire of Horne and Ostberg (1976)
* Having cognitive abilities to understand oral instructions, objective by a Mini Mental State Examination (MMSE) score greater than or equal to 24
* Having a personal computer with a web cam, a microphone and an internet connection
* Living in Normandy
* Affiliated to the social security system
* French-speaking

Exclusion Criteria:

* Illiteracy
* Age-related macular degenerescence (AMD), blindness, visual acuity \< 2 and other pathologies reducing the perception of light
* Bradycardia treatments (beta-blockers, digitalis, antiarrhythmics, bradycardic calcium channel blockers, etc.)
* Declaration of dementia (Alzheimer's disease, vascular dementia)
* Declaration of vestibular or neurological anomalies
* Declaration of progressive neurological disease (brain tumour, epilepsy, migraine, stroke, sclerosis, myoclonus, chorea, neuropathy, muscular dystrophies, myotonic dystrophy, Parkinson's disease)
* Declaration of pathologies with short-term vital prognosis (cancer)
* Unbalanced cardiovascular pathologies (uncontrolled high blood pressure, coronary artery disease, heart failure, cardiac arrhythmia due to atrial fibrillation)
* Endocrine pathology (hypothyroidism, hyperthyroidism, type 1 diabetes)
* Breathing failure
* Recent hospitalisation (\< 30 days)
* Declaration of unstable psychiatric condition (psychosis, depression, bipolar, disorder)
* Chronic medication that may interfere with memory measures or that may alter the quantitative and qualitative parameters of sleep (antidepressants, neuroleptic, antiparkinsonian drugs, corticosteroids, antiepileptics, central analgesics and muscle relaxants)
* Presenting drug and/or alcohol addiction, coffee abuse
* Having an extreme Chronotype (score on Horne and Ostberg Circadian Typology Questionnaire ≤ 30 or ≥ 70)
* Having a moderate or high level of physical activity (categorial score in the International Physical Activity Questionnaire (IPAQ) short version)