For smartphones, "smart" alarms offer missions (like solving a math problem) to ensure you actually wake up.

Press Start and type "Clock" or "Alarms & Clock". Free Alarm Clock : A lightweight, full-featured program.

: Available in the Microsoft Store, this "freemium" app includes world clocks, weather reports, and a music player.

Most modern computers come with a built-in application, but you can also download specialized third-party tools for more features.

Приложения в Google Play – Простой Будильник