I took the Cheapest overnight sleeper train in Japan from Osaka to Tokyo.
The Sleeper Express train SUNRISE SETO & IZUMO is the only train in Japan that runs every day
Fare→12,400JPY/107USD

【Related videos that I used as a reference】
・Kuga’s Travel, Riding the Sleeper Train in Japan on a Heavy Snow Day (Tokyo→Izumo-shi)                
 
・Travel Alone Idea, Japan’s Overnight Sleeper Train 😴 CHEAPEST Seat 🛏 Osaka→Tokyo Sunrise Express 寝台特急 サンライズ出雲 ノビノビ座席
 
・WAO RYU!ONLY in JAPAN, Japan’s Night Train: The Sleeper Car Adventure 寝台列車サンライズ出雲
 
・Abroad in Japan – Inside Japan’s SLEEPER Train | $160 FIRST CLASS Room

・謎のちゃんねる – サンライズ出雲号で出雲市に行ってきた

・Kara and Nate, OVERNIGHT TRAIN Oslo to Stavanger, Norway (first class private room)

・The Man in Seat 61, Toronto to Vancouver by train: VIA Rail’s ‘Canadian’

AloJapan.com