Write the next sentence in the following story.

How to condition your body to need less sleep
Exercise.
If you expect to function without sleep you'll have to build up your body's overall strength. Exercising three or four times a week can build your overall strength and stamina, resulting in you needing less sleep.
Focus on aerobics, like running or jogging, swimming, as well as mild weight training, such as lifting weights, doing push or sit ups, and pilates. Exercise in the afternoon is ideal as your overall sleep quality at night improves.