1. a person or thing that awakens or rouses someone from sleep
2. a person or thing that causes someone to become aware of or interested in something

Examples

• The alarm clock served as her daily awakener at 6 a.m.
• His speech was an awakener for the community about environmental issues.
• The documentary proved to be an awakener of social consciousness.
• She used her phone as an awakener instead of a traditional alarm.
• The crisis was an awakener to the need for better safety measures.
• Morning light can be a natural awakener for your body's circadian rhythm.