Observation
e nipat. …when she is asleep.

The forms of the Conjunct Indicative Neutral (#11) are widely used. They are usually preceded by conjunct preverbs:

With the conjunct preverb e, they indicate the present tense or neutral.

e nipat. …when she is asleep.

With the preverb tshe, they indicate future events.

Ekute tshe nipat. This is where she will sleep

After the preverb ka, the forms of the CIN (#11) can indicate a relative clause, present or past:

ka nipat. …the one who is asleep/the one who was asleep

or a subordinate clause in the past:

Ka aimian utakushit mitshetinanipan. When I spoke yesterday there were many people.

The following examples illustrate some common subordinate clauses with the CIN (#11):

Nitshisseńimau auen e nipat ute. I know that someone is sleeping here.
Nitshisseńimau auen ka nipat ute. I know the person who slept here.

Link to the conjugation guide.

Observation
Auen nepat? Who is sleeping?

nepat is called a changed form of nipat. The changed forms of the Conjunct Indicative Neutral (#11b) are used for questions in the present tense.

For Past and Future questions, we don’t use the changed form but rather the simple form of the verb with the past or future conjunct preverbs:

Auen ka nipat. Who was asleep?
Auen tshe nipat. Who will sleep?

We also find the changed form in subordinate and co-subordinate clauses.

Nitshisseńimau eteńitakushit. I know how he is, how he behaves.
Ekute anite etat anutshish. That’s where he finds himself now.
Tekushiniht anite utitaunnuat, apishish aieshkushiu ne tshisheńnu.
Arriving at their hunting territory, the old man rests a bit.
Tiré de Tanite nene etutamin nitassi? – An Antane Kapesh p.19
 
[…] eishinikatakanńiti aueshisha kie namesha, kassinu neńu uauitamueu neńua ussima.
He tells his grandson the name of all the animals and fish.
Tiré de Tanite nene etutamin nitassi? – An Antane Kapesh p. 9

Link to the conjugation guide.