Table 1 Sample characteristics (mean ± SD)

Age (years)

65.2 ± 8.2

Sex (N)

37F/35M

Ethnicity

Caucasian

Right-handed (N, %)

72 (100)

Body mass index (kg/m²)

25.5 ± 4.0

MMSE (score)

28.9 ± 1.2

APOE ε4 carriers (N, %)

21 (29)

Total tau (pg/ml)

2.5 ± 0.7

P-tau₁₈₁ (pg/ml)

1.7 ± 0.5

Aβ₄₀ (pg/ml)

228.9 ± 33.6

Aβ₄₂ (pg/ml)

12.1 ± 2.3

Subjective sleep quality (total GSQS score)

3.3 ± 3.6

Nocturnal awakenings (self-reports)

1.8 ± 1.2