As many as 90 to 100 bright meteors might be seen each hour, with activity peaking in the pre-dawn hours, astronomers say.

I had many pre-dawn hours to ruminate.

Two mine sweepers with two destroyers to provide covering fire entered the lagoon in the pre-dawn hours and cleared the shallows of mines.

It blooms both day and night, but typically in the pre-dawn hours, closing when the full sun hits them.

It's more common to have frost on the ground briefly in pre-dawn hours, but it melts shortly after sunrise.