Short-Sleeper YouTuber Daisuke Hori Vows Legal Action Over Unauthorized Reposts and Slander, Makes Most of His Stream Archive Private

Background and Key Points

Japan’s “short sleeper” (ショートスリーパー) phenomenon centers on entrepreneurs who claim they trained themselves to function on very little sleep and now sell that method through seminars, books, and YouTube memberships. Daisuke Hori runs his operation under a “general incorporated association” (一般社団法人) — a corporate structure in Japan that anyone can register with minimal capital and no government vetting, unlike a “public-interest incorporated association” (公益社団法人), which does undergo state scrutiny. The official-sounding name gives the enterprise an air of institutional legitimacy that the legal status itself does not confer. Genuine natural short sleepers do exist and are studied by sleep scientists — they carry rare gene variants (e.g., DEC2) and typically sleep four to six hours, not the 30-minute figures associated with Hori’s brand — but mainstream sleep medicine does not support the idea that this trait can be taught to the general public.

The thread doesn’t split much over whether Hori’s claims are true — that’s near-unanimous skepticism — but over what the archive lockdown means and whether pursuing legal action is reasonable. Some read it as a tacit admission he’s been discredited by doctors and is now hiding evidence; others focus on the mechanics, urging him to livestream continuously to prove his claims can’t be faked by clipping.

What’s likely to go unmentioned: this is a paid membership operation (1,990 yen/month per one poster), so the copyright and defamation threats aren’t just reputational — leaked or freely reposted footage undercuts a subscription product built on scarce access to “proof.”