| induce sleep | 0.59 |
| taken over long periods… | 0.49 |
| stay in the bloodstream | 0.40 |
| learn about side effects | 0.40 |
| impair performance | 0.35 |
| treat insomnia | 0.31 |
| give a hangover effect | 0.29 |
| memory impairment | 0.44 |
| depression | 0.34 |
| drowsiness | 0.27 |
| hallucination | 0.22 |
| aggressiveness | 0.16 |
| amnesia | 0.16 |
| dizziness | 0.16 |
| antihistamine | 0.25 |
| prescribed | 0.67 |
| tested | 0.32 |
| referred as z-drugs | 0.26 |
| sure to learn | 0.25 |