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Intraindividual standard deviations (ISDs) for arousal and sleep variables.
| Variable | Younger adults | Older adults |
|---|---|---|
| ISD | ISD | |
| SOL | 13.01 | 17.84 |
| WASO | 13.51⁎ | 25.79⁎ |
| TST | 98.27⁎ | 70.78⁎ |
| SQR | 2.31⁎ | 3.02⁎ |
| PSAS somatic | 1.22 | 1.46 |
| PSAS cognitive | 3.40 | 2.71 |
Denote statistically significant differences between older and younger adults (p<0.05).
