this trigger is hard..can someone help?

hihi, i would like to ask if anyone know the trigger of "when a unit is being attack while asleep, i does not wake up" or "sleep right away after it wake up"
or any similar effect. all i want is the unit not to be able to do any action while night time. can anyone help me out??

have a dummy caster cast sleep when unit is attacked. for dummy caster info use search.

You might be able to pause him after he falls asleep and then unpause when day breaks.