The term 'arouse from sleep' can be solved by two crossword solutions: 'WAKEN' (5 letters) and 'WAKE' (4 letters). WAKEN is a verb meaning to cause someone or something to become active, alert, or conscious, often from a state of sleep. WAKE is also a verb meaning to cause someone or something to become active, alert, or conscious, but it can also mean to be or remain alert or attentive. Both words are used to describe the act of arousing someone from sleep.