Table 1.
Comparison between in-ear-EEG and scalp-EEG in detecting sleep latencyb
| Sleep Latencies | Usual night sleep | Sleep restriction | ||||||
|---|---|---|---|---|---|---|---|---|
| N | Scalp | In-ear | P-value | N | Scalp | In-ear | P-value | |
| Sleep latency of nap 1 (minutes) | 23 | 11.1±6.2 | 11.7±6.2 | 0.40 | 17 | 9.6±5.9 | 10.7±6.2 | 0.14 |
| Sleep latency of nap 2 (minutes) | 23 | 12.0±6.4 | 11.9±6.4 | 0.10 | 19 | 11.6±6.7 | 12.2±6.9 | 0.59 |
| Sleep latency of nap 3 (minutes) | 23 | 12.7±7.0 | 12.4±6.7 | 0.50 | 17 | 8.4±5.1 | 9.1±5.7 | 0.14 |
| Sleep latency of nap 4 (minutes) | 16 | 15.6±5.7 | 15.6±5.7 | 0.81 | 16 | 12.5±6.5 | 12.7±5.2 | 0.27 |
| Mean sleep latency all naps (minutes) | 23 | 12.4±5.2 | 12.7±4.9 | 0.38 | 19 | 10.4±4.8 | 10.9±5.1 | 0.26 |
| Mean sleep latency of nap 1–3 (minutes)a | 23 | 12.4±5.3 | 12.7±5.1 | 0.49 | 19 | 10.0±4.7 | 10.5±5.1 | 0.37 |
Notes:
a
This measure of sleep latency is calculated to show that the data missed on nap number 4 due to technical problems did not change the group mean sleep latency.
b
Data are presented as mean±SD.
Abbreviation: EEG, electroencephalogram.