How and when to use SLEEP() correctly in MySQL?

In relation to my other question today I am wondering how to use MySQL's SLEEP(duration) correctly.

From what I gathered reading MySQL Dev forums and very vague description in MySQL Docs I can't use it this way:

SELECT ... SLEEP(1); /* wait for a second before another SELECT */ SELECT ... 

So what is it good for then?

2 Answers

If you don't want to SELECT SLEEP(1);, you can also DO SLEEP(1); It's useful for those situations in procedures where you don't want to see output.

e.g.

SELECT ... DO SLEEP(5); SELECT ... 

SELECT ... SELECT SLEEP(5); SELECT ... 

But what are you using this for? Are you trying to circumvent/reinvent mutexes or transactions?