Nemu Nemu no Mi

The Nemu Nemu no Mi, also known as the Nemu Nemu Fruit, can make anyone fall asleep. It was eaten by Noko in the game only.

Strengths and Weaknesses
This fruit's main (and only) power, as demonstrated by Noko, can hypnotize an opponent to sleep. With the seahorse flute's power to manipulate memories, the fruit can become much more powerful. The fruit almost beat the Straw Hat Pirates.

in the games, it was stated that to use is power he must blow his flute to enable his devil fruit fruit which is likewise simmilar to what is shown in the anime.

This fruit doesn't seem to have any specific weaknesses, aside from the standard Devil Fruit weaknesses.

Usage
Noko mainly uses this power to put his opponents to sleep.

Reference

 * - A video showing the game where this Devil Fruit appears
 * http://babelfish.yahoo.com/translate_url?trurl=http%3A%2F%2Fwww.bandaigames.channel.or.jp%2Flist%2Fonepiece_ocean%2Fstory.html&lp=ja_en&.intl=us&fr=yfp-t-101 - the full explanation of the fruits power in the game.