Sleep characteristics among 10 740 included participants.
| Sleep characteristics | Overall (n=10 740) | Cognitive impairment | |
| Yes (n=1789) | No (n=8951) | ||
| Postlunch napping duration (N, %) | |||
| 0 min | 4960 (46.2) | 865 (48.4) | 4095 (45.7) |
| 1–30 min | 1933 (18.0) | 269 (15.0) | 1664 (18.6) |
| 31–60 min | 2017 (18.8) | 327 (18.3) | 1690 (18.9) |
| >60 min | 1830 (17.0) | 328 (18.3) | 1502 (16.8) |
| Night-time sleep duration (N, %) | |||
| <5 hours | 1397 (13.0) | 290 (16.2) | 1107 (12.4) |
| 5–6.9 hours | 4169 (38.8) | 710 (39.7) | 3459 (38.6) |
| 7–8.9 hours | 4488 (41.8) | 646 (36.1) | 3842 (42.9) |
| ≥9 hours | 686 (6.4) | 143 (8.0) | 543 (6.1) |