* Ξυπνάω (xypnáō): This is the most common and generally suitable word for "to awaken" in the sense of waking up from sleep.
* Εγείρω (egeirō): This word implies a more forceful or complete awakening, sometimes suggesting awakening from a deep sleep or even a metaphorical awakening (e.g., awakening to a truth).
* Αφυπνίζω (apypnízō): This is a more formal and literary word, also suggesting a more profound awakening, often used in a metaphorical sense.
The best word to use will depend on the specific situation. For simply waking up from sleep, ξυπνάω (xypnáō) is the best choice.