a contraction of "chill" and "nap".
different than a powernap in that a powernap is preemptive, while a chi-nap (minimum 25 mins) can come before or after activity or inactivity. A chi-nap is characterized by fatique and chillness, that transitions into a light sleep or quiet time..
related words: chi-lounge, chillax, chi-frickin'awesome
I'm going to need a chi-nap after this hike brew.