Incense of Spring Sleep (item)

The Incense of Spring Sleep is an Incense which Happosai learned about from his Grimoire and made to try and put Ranma to sleep for what he did to him earlier that day (beating him up in the manga and getting him off guard so the female Furinkan High School students can beat him up in the anime). However, while trying Ranma to smell the Incense he makes Akane smell it instead, causing her to fall to it's effects after an unknown time period.

The Incense is meant for those who cannot sleep due to their lives being in constant danger as it allows the inhaler to sleep while still being able to defend themselves from assassins. However, should the Incense be used in a time of peace the inhaler will go on an uncontrollable rampage. Akane fell foul of the Incense being used on her during a time of peace so began to destroy large areas of Furinkan (along with most of the Cat Café). While affected by the Incense Akane also seemed to have dreamed which her movements within affected the real world as well, such as attacking Ranma for two-timing with Shampoo and Ukyo in her dream.

There seems to be several ways to counter the Incense. In the manga Akane was awoken by the smell of Mosquito repellent. The the anime, several alternative methods were added to possibly waking Akane. These include using a Spicy Incense (which acts similar to the Mosquito repellent in the manga) which, according to Cologne, is able to wake anyone who smells it, regardless of how asleep they are. However, in the anime Akane was eventually awoken by Kasumi who as she doesn't have any sense of bloodlust about her was able to get close enough to Akane to wake her.