Sleep Dagger's description says it does not interrupt enemy's channeled abilities, but it does interrupt some. Sometimes the enemy gets a message "X interrupted by Sleep Dagger" but not always. Some abilities that are not interrupted are still allowed to aim during it while others aren't.
Abilities that get interrupted:
Abrams: Shoulder Charge (no message).
Calico: Leaping Slash, Ava
Grey Talon: Rain of Arrows, Guided Owl
Infernus: Flame Dash
Ivy: Air Drop (start up and after flight starts)
Kelvin: Ice Path
Pocket: Barrage
Shiv: Slice n Dice (no message)
Vindicta: Flight
Wraith: Project Mind (not put on cooldown)
Yamato: Power Slash (not put on cooldown), Flying Strike (no message)
Abilities that can still aim:
Grey Talon: Charged Shot
McGinnis: Heavy Barrage
Krill's Burrow is the only channeled movement ability that doesn't get interrupted.
Bebop's Hyper Beam is the only aimable ability that can't aim while slept.
Abilities that get interrupted:
Abrams: Shoulder Charge (no message).
Calico: Leaping Slash, Ava
Grey Talon: Rain of Arrows, Guided Owl
Infernus: Flame Dash
Ivy: Air Drop (start up and after flight starts)
Kelvin: Ice Path
Pocket: Barrage
Shiv: Slice n Dice (no message)
Vindicta: Flight
Wraith: Project Mind (not put on cooldown)
Yamato: Power Slash (not put on cooldown), Flying Strike (no message)
Abilities that can still aim:
Grey Talon: Charged Shot
McGinnis: Heavy Barrage
Krill's Burrow is the only channeled movement ability that doesn't get interrupted.
Bebop's Hyper Beam is the only aimable ability that can't aim while slept.
