Sleep standing? Possible?

How many of you actually know or see people who can sleep while standing? At least we got one child who can do that... Akid (mengantuk sangat punya kes);

p/s: Perhatian! Stunt dilakukan in control environment i.e car speed slow giler(less than 80km/h), low-traffic volume area & by professional driver (me-hahaha).. so don't do this at home, i mean it's very dangerous to drive while taking video ok. I've stop doing that & tahun depan anak2 semua sumbat belakang & buckle up. No play2 anymore... Kapish?