Sentence examples for alert at from inspiring English sources

Obviously, the Bureau never sleeps, is alert at all hours.

Is it difficult to stay mentally alert at night?

They must stay awake and alert at all times.

On 20 October 1941 Crozier noted "Alert at 8.50.

When Officer Loor arrived at the hospital, Dr. Bederson said, he was alert at first.

He was serving on nuclear alert at a Minuteman missile bunker deep under the Great Plains.

In nontheme news, we have another EMU alert at 41 Down (they're everywhere, aren't they?

The device can also be set to sound an alert at customized speeds.