Having worked for clients from SV, Japan and a few European countries, including my own, I would guess that it's not tech in general, but SV and VC culture that

Having worked for clients from SV, Japan and a few European countries, including my own, I would guess that it's not tech in general, but SV and VC culture that's the reason here. Case in point: no other crowd is so accepting of using drugs or other substances to increase work performance. Yes, there is coffee as the most common of such means, but funnily enough I had to ditch it cold turkey to keep up with these people, because improving my sleep quality instead was more effective. Bottom line is SV offers more reward, but puts more pressure so it's not for everyone - especially not for me who loves his job, but certainly isn't married to it.