The Sleeping Bloon is a bloon that can appear on the screen in any position. It has 20 health, but it heals itself every 3 seconds. Therefore, you must do 20 damage to it in less than 3 seconds, between the times it heals itself. It can't escape, but you can't move on until you have beaten it. While tedious, it is possible to get more money by hitting it for a long time without destroying it (damaging it causes you to get very small amounts of money). A giant, Overpowered version of the Sleeping Bloon is featured in the Don't Let Sleeping Bloons Lie special mission.