He'd asked about specific dangers to which he should be most alert.

"If this investigation is to continue, we are going to need the entire crew at their most alert."

Since the road came in from the east and reached the house on the other side, they assumed any watchers would be most alert there.

Elderly people also are often sleepy when they want to be most alert.

Behind them is the most alert mind of the century.

"Thou two must be most alert, when we do return."

Also, pay attention to which times of day you feel most alert.

He sensed he'd soon need to be at his most alert.

My choice had to be made with the greatest care and the most alert diagnostic skill.

I might not have been at my most alert, but I still knew it was important to get some food in me.