At night they come without being fetched,
and by day they are lost without being stolen.

What are they?

I agree with the solution stars. though the problem was a little vague.

All the other solutions I saw had to do with sleep. Not everyone sleeps at night, and therefore, nighttime and "sleep time" are not synonomous. With that rule in place, stars are the only thing I can think of without going too deep. But since the problem is difficulty level 2, it's obvious that it should be a fairly straightforward answer.

In short, I think Ravi did a good job. Nice riddle.

Posted by Stephen on 2006-12-01 14:35:27