1. Concomitant ingestion of alcohol [7] [10] , or sedating medications [7] .

2. Concomitant sleep disorder such as OSA [7] [9] .

3. History of parasomnia [7] .

4. Hypnotic sedative ingestion at times other than habitual bedtime [7] .

5. Hypnotic sedative ingestion when sleep deprived [7] .

6. Poor management of pill bottles [7] .

7. Dose dependent ZISI [4] [8] , SO [9] .

8. Living alone [7] .