Yes depending on the sleep state. Also some power is going to ram to keep it alive. I think for framework it's in the realm of 5% an hour or something like that.
I usually go the hibernation route.
Desktops I sleep to ram, laptops I hibernate to the SSD.
I think that there's a 5% failure rate of cluster bombs. So if you drop a few, there will be a few UXOs still laying around.
Best bet is to use a MICLIC or those mine sniffing rats.