I found some issues with sleep bolts:
Doesn't always sleep when effect shown.
Doesn't resleep if already sleeping.
Sometimes effect isn't even shown.
Correct Implementation:
Target will always be slept if a bolt / arrow hits it.
The duration will be greatly lowered on NM / higher mobs.
Hitting an already slept monster with a sleep bolt will remove sleep (damage dealt woke it up) and add it again.
Here is a reference: http://wiki.ffxiclopedia.org/wiki/Sleep_Bolt.
Sleep Bolt Bug
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NO LONGER BEING MAINTAINED!
Re: Sleep Bolt Bug
Just posted a patch to fix these issues.