title: In *nix, what causes "sleeping" in top command?
body: <p>What causes these <code>sleeping</code> processes that I see in <code>top</code>? If I were to call PHP's <code>sleep()</code> function, would that add to the <code>sleeping</code> count I see in <code>top</code>? Are there any disadvantages to having a high number in <code>sleeping</code>?</p>