| minute nap | 7 |
| short nap | 6 |
| power nap | 2 |
| afternoon nap | 1 |
| daytime nap | 1 |
| improve alertness | 0.63 |
| improve performance | 0.43 |
| stand for name | 0.39 |
| run in same direction | 0.39 |
| improve memory | 0.38 |
| confuse the body | 0.38 |
| restore alertness | 0.37 |
| fall asleep | 0.34 |
| laze in hammock | 0.34 |
| call non-aggression axi… | 0.32 |
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| grogginess | 0.25 |
| sleep inertia | 0.16 |
| short period of sleep | 0.45 |
| short naps | 0.19 |
| dropped | 0.52 |
| created equal | 0.46 |
| taken as response | 0.45 |
| developed | 0.41 |
| important for baby | 0.35 |
| created | 0.32 |
| likely to interfere | 0.32 |
| launched | 0.29 |
| violated | 0.29 |
| proven to boost creativ… | 0.28 |
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