The term 'rouses from sleep' can be expressed in three different ways: AWAKENS (7 letters), AWAKES (6 letters), and WAKENS (6 letters). All three words refer to the act of waking up from a period of sleep. This is usually done by an external stimulus such as an alarm clock or the sun rising. The act of rousing from sleep is a natural part of the human circadian rhythm, which is the body's internal clock that regulates when we feel sleepy and when we feel awake.