The best time wasters are games that are intellectually challenging, but not necessarily frantic or anxiety-inducing. Too many puzzle games rely on a beat-the-clock scenario to make games more challenging instead of simply making the puzzles more challenging. Well, Sleepy is a time waster that doesn't do that.

In Sleepy, the goal is to remove all of the colored blocks from the screen without waking them up. If you wake them up, a wakefulness bar starts to drop, and if it reaches the bottom, you lose at that level. The more blocks that wake up, the faster the bar moves, until they settle into new positions and fall back asleep.

The challenge in the game comes from the fact that you can only remove blocks of the colors given on one of the two indicator cards at the bottom of the screen. When one of the colors is a block that is sitting on top of a pile, it's not a problem, but soon you'll run into a situation when the only block you can remove will dislodge a bunch of other blocks, waking them up.

Sleepy is a cleverly-designed game with lots of replay value, a perfect distraction for your coffee-break or lunch time. And the soundtrack is perfect if you've got insomnia - just play Sleepy for a little while and you'll be headed back to bed.