| Clue | Source | Date |
|---|---|---|
| Places where days of rest are observed? | LA Times Daily | 14 Mar 2026 |
| Places where apnea is studied | USA Today | 07 Sep 2020 |
| Milieus where exploding head syndrome is studied | ||
| Places where apnea might be studied | ||
| Some EEG users | ||
| Places for REM studies |