| Answer | Crossword Clue |
|---|---|
| EYELIDS | They're usually closed at night |
| EYELIDS | They're usually heavier at night |
| METRO | Subway that is closed at night. |
| ESL | Subj. usually studied at night |
| SOMINEX | Product usually used at night |
| APNEA | Problem usually encountered at night |
| IRIS | A lid usually covers it at night |
