"5 Weapon Strike Poison Sleep" is an impossible call, for the same reason "5 Weapon Spell Strike Sleep" is impossible: you can't have two Qualifiers on a single attack.
The call, if a Raging Blow and Sleep Coating are used, should be "5 Poison Strike Sleep". Poison Coatings change the Qualifier of the swing from Weapon to Poison, but Raging Strike doesn't specify that the Qualifier has to be Weapon to use it, just that it can be used with "a single numeric weapon swing", and that it adds the Strike keyword to whatever swing that happens to be. So, yeah, with everything available to me, I'm fairly sure the call is "5 Poison Strike Sleep", if you can combine the two; if you can't for some reason, then using Raging Strike would cause your Poison to become inert and wasted (without Poison Trigger).
Also, you can't Evade, Parry, or Weapon Shield "5 Poison Sleep", but your armor would block the Poison Sleep if you had at least 5 points left, and a Poison Shield or Resist Poison would negate the entire attack.