Answer:
theta waves with sleep spindles and K-complexes
Explanation:
K-complexes and sleep kindles are known to be defining brainwaves of stage 2 REM or sleep. Duke has not entered the deep sleep stage or the slow wave sleep stage which are characterized by low frequency and high delta waves. While K-waves are large theta waves that usually occur in response to stimulus such as sound, and hence Duke must have been awakened by the sound of the door.
Cuneiform system of writing
Brihadratha ruled India after Ashoka, and was assassinated fifty years after Ashoka's death
The second most spoken language in europe is german