Although the words alert and wide-awake have much in common, alert stresses readiness or promptness in meeting danger or in seizing opportunity. //...

The synonyms vigilant and wide-awake are sometimes interchangeable, but vigilant suggests intense, unremitting, wary watchfulness. // eternally vig...

While in some cases nearly identical to wide-awake, watchful is the least explicit term. // the watchful eye of the department supervisor