The Rancher folks showed it running on a raspberry Pi and it was only using 30% of one of 4 cores or similar. I don't think it would let your laptop go fully asleep, but shouldn't consume too much power if it's awake.
If you are on linux, I've found microk8s to be much more performant. It still slows my system down (Macbook Air with just 4GB RAM) but it is noticeably better than minikube.
I sat in on the webinar and was impressed. I've been looking for something easy/simple that would handle 2 to 8 nodes with bare metal. Including CoreDNS, Flannel, automatic certs, and
is easy to install.
I'm open to other options though if anyone has a favorite.