The time (ma-) is evening, nighttime.
Mahep dana, ta mapon danaw manok.
It is already evening, because the chickens are roosting already.
Someone (om-) does something (i-) before dawn, just as night is ending.
om- omhep, min- minhep
sápa
aga
kalu
Omhep ako a manotong, ta magbyahi kami.
I cook before dawn, because we are going on a journey.
Minhep kaya nawara.
You arrived before dawn.
Inhep ko a pinakan bago ko.
I fed the pig before dawn.
Someone or something (ma--an) is overtaken by night.
ma--an mahpan
Mahpan ka an mayam ka pas changori.
You will be overtaken by night if you still (continue to) go now.
kahep
Last night.
kahahep 'every night'
maychahpan
Any time of the day until night.
abak no mahep
Halfway through the night, midnight.
hatinggabi
havak nu'hep
anchan mahep an delak
Tomorrow night.