This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to look refreshed when you wake up
Let in natural light.
Sunlight, or an artificial alternative, helps your body accept the awakening. Not only will you wake up easier, but you'll reset your body's clock, feel better rested, and improve your mood.

Choose from: (1). Do some exercise first thing in the morning. Exercise increases body temperature and releases endorphins that help you awaken.; (2). Set an alarm and let it go off at sometime in the day. Studies have shown that people who select natural sunlight reduce their risk of developing sun-related disorders, such as cirrhosis or cancer.; (3). Get in the habit of letting in natural light in the morning. Whether you're seeing a movie, taking a walk in the park, or watching a new show, sunlight will keep you energized.; (4). You don't have to spend every waking moment of the day in the sun. Window exposure seems to be the only positive stimulant for most people.;
The answer is:
(1).