Reveille (noun)

A bugle call or drum signal sounded early in the morning to wake up military personnel.

Origin:

French word "réveillez" meaning "wake up".

Examples:

1. The sound of reveille signals the start of a new day on the base.
2. Reveille was played at 6am every morning.
3. The bugler played reveille to signal the end of sleep.
4. The reveille was always loud and clear, ensuring that everyone woke up on time.
5. The sound of reveille was always the first thing that soldiers heard in the morning.