Total sleep time

1. Total sleep time has no effect on GDF-15 in humans.

   Humansmild cognitive impairmentplasman = 118

   Association of plasma growth differentiation factor 15 with wake after sleep onset in mild cognitive impairment · The journal of nutrition, health & aging · 23 Sep 2026

GDF-15 →

1. consumer sleep technologies increase total sleep time in humans.

   Humanscompared with polysomnographyn = 74

   Are different consumer sleep technologies measuring the same essential aspects of sleep? · Sleep · 22 Aug 2026

1. Vitamin D deficiency is associated with total sleep time in humans (B = -23.03 minutes, 95% CI: -42.05, -4.01).

   Humansserumn = 460

   Association of Vitamin D and B12 Levels with Actigraphic Sleep in Cognitively Unimpaired Middle-Aged and Older Adults · The journals of gerontology. Series A, Biological sciences and medical sciences · 4 Sep 2026

Vitamin D deficiency →

1. Vitamin D is associated with total sleep time in humans (B = 23.63 minutes, 95% CI: 9.62, 37.64).

   Humansserumn = 460

   Association of Vitamin D and B12 Levels with Actigraphic Sleep in Cognitively Unimpaired Middle-Aged and Older Adults · The journals of gerontology. Series A, Biological sciences and medical sciences · 4 Sep 2026

Vitamin D →

1. Total sleep time raises the risk of reduced kidney function in humans (OR = 1.35, 95% CI: 1.15-1.57).

   Humanskidneyn = 1,493

   Independent and joint associations of sleep and 24-Hour rest-activity rhythms with reduced kidney function in older adults · Geriatric nursing (New York, N.Y.) · 2 Sep 2026

Reduced kidney function →

1. Total sleep time is associated with dementia in humans.

   Humansdementia-free at baselinemedian 5.2 yearsn = 2,316

   Novel sleep metrics derived from chest-worn accelerometers are associated with dementia risk: the Atherosclerosis Risk in Communities neurocognitive study · Sleep advances : a journal of the Sleep Research Society · 19 Aug 2026

Dementia →

1. Total sleep time predicts adiponectin in humans (B = 0.26, [0.081, 0.44], p = .007).

   Humans

   Associations of actigraphic sleep parameters with adipokines in older adults in the Baltimore longitudinal study of aging · Sleep advances : a journal of the Sleep Research Society · 23 Jul 2026

Adiponectin →