Research Article
“Are We in Sync with Each Other?” Exploring the Effects of Cosleeping on Heterosexual Couples’ Sleep Using Simultaneous Polysomnography: A Pilot Study
Table 1
Subjective and objective sleep measures during single sleep and cosleep.
| | | Mean | SD | | | Single | Couple | Single | Couple |
| | Sleep protocols | | | | | | | Subjective sleep time (min) | 287.5 | 341.1 | 113.0 | 82.1 | 0.007 | | Feeling recovered (from not at all (1) to very (5)) | 2.6 | 2.9 | 0.8 | 0.6 | 0.054 | | Morning condition (from depressed (1) to lighthearted (6)) | 3.8 | 4.1 | 1.5 | 1.5 | 0.232 | | Morning condition (from feeling run down (1) to refreshed (6)) | 3.1 | 3.1 | 1.2 | 1.1 | 0.806 | | Morning condition (from tense (1) to relaxed (6)) | 3.5 | 4.3 | 1.4 | 1.5 | 0.029 |
| | PSG-data | | | | | | | Total sleep time (min) | 324.5 | 358.0 | 90.1 | 57.5 | 0.014 | | Sleep efficiency (%) | 75.1 | 83.7 | 19.2 | 11.3 | 0.004 | | N1-latency (min) | 21.5 | 22.7 | 9.8 | 10.7 | 0.734 | | N2-latency (min) | 39.7 | 29.2 | 21.8 | 11.0 | 0.034 | | N3-latency (min) | 52.7 | 41.4 | 24.1 | 13.7 | 0.045 | | REM-latency (min) | 147.6 | 113.6 | 93.0 | 64.1 | 0.113 | | N1-percentage (%) | 16.1 | 12.6 | 11.0 | 6.3 | 0.083 | | N2-percentage (%) | 45.9 | 41.8 | 11.0 | 6.3 | 0.077 | | N3-percentage (%) | 25.8 | 28.6 | 8.8 | 7.3 | 0.164 | | REM-percentage (%) | 12.3 | 17.0 | 5.7 | 3.3 | 0.024 | | Number of awakenings | 21.8 | 22.0 | 6.3 | 5.7 | 0.868 | | Number of awakenings/hour | 4.6 | 3.8 | 2.4 | 1.3 | 0.087 |
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Note. values < 0.05 are in boldface; value of paired, two-tailed t-tests (single sleep versus cosleep).
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