
1) Less sleepy 2) More attentive 3) More observant 4) More vigilant 5) More watchful 6) One warning
Found on
https://www.crosswordclues.com/clue/alerter

Similar to the Dead man's switch other than it does not require the operator's constant interaction. Instead an alarm is sounded at a preset interval in which the operator must respond by pressing a button to reset the alarm and the timer. If the operator does not respond within a preset time the brakes are applied. May also be called a 'Watchdog'....
Found on
http://www.translationdirectory.com/glossaries/glossary256.php
No exact match found.