expression, ichidan verb
wake up; awake from sleep
A slightly literary or formal way to say 'wake up', emphasizing the transition out of sleep. In everyday speech, 目が覚める is more common.
深い眠りから覚めたとき、外はもう明るかった。
When I awoke from a deep sleep, it was already light outside.
More common and casual way to say 'wake up'. 眠りから覚める is more literary and emphasizes the state of sleep.
Phrase composed of 眠り (sleep) + から (from) + 覚める (to wake). The verb 覚める is an ichidan verb meaning 'to wake' or 'to become aware'.