How does it define a "condition"? Does it give an example?
Dictionary:
Condition - Law.
a. a stipulation in an agreement or instrument transferring property that provides for a change consequent on the occurrence or nonoccurrence of a stated event.
b. the event upon which this stipulation depends.
Stipulation - a condition, demand, or promise in an agreement or contract.
If you take out the "transferring property" bit that's basically what you are doing. I would consider an appropriate, single condition to be:
Wake me when any person, creature, or entity that is larger than a hare and that is not my known ally enters within any part of the area that I can perceive with this spell.
Broken up, it has:
Result to occur - "Wake me"
Condition, type of creature - Any entity larger than a hare that is not a known ally.
Condition, Location of creature - This technically isn't needed, but we say, if you see one anywhere this spell works, tell me.
If you wanted to simplify, you could do:
"Wake me if I perceive any entity larger than a hare that is not my known ally." That should work, since the spell knows what it can perceive and what it can't, and since you don't limit it, it should go to the maximum perception.