...or simply try to work around being unprepared.
1. When i made mistakes in preparation and my "safety bridge" went down, i shifted attention to running around and trying to take down as many as i could until morning came.
2. When my defenses didn't last long enough (badly prepared), i tried escaping through my house, then the roof and back down on the ground. There are ways for zombies to get stuck in a house POI before they can get out again...
3. When i didn't have time to set up all the spikes and things, i simply crafted the remaining on the fly and put them up on the way towards me (through the POI). Gonna take at least a couple of them down before i have to run...
4. When things got worse and i didn't have a back up plan (or it went down as quickly as other things), i fought as much as i could and died...
There are many more solutions you can go through. Never tried resetting time myself.