<p>I’ve run off the biphasic mode for three to four years. So have several of my friends. It works. 3-5 hours a night + 2-3 hour naps in the afternoon. Only side effect is you’ll be slightly cranky during the day and a bit tired. (I was involved in sports and various clubs after school as well, so it’s absolutely possible.)</p>
<p>As for the original question, no - four hours a day sleeping won’t work. As hilsa said, it’ll just add up, and you’ll be sleeping in on the weekends.</p>