Pokemon Sleep was announced all the way back in 2019, and then it was never mentioned again. It was never formally cancelled, but given the fact that it dropped off the face of the earth, it was assumed that Niantic and The Pokemon Company had decided to scrap the project. That is, until some recent developments.
As spotted by fans online, the Pokemon Sleep website has received a surprise update - redirecting to the Pokemon Day page. This heavily suggests that the game is going to get re-revealed during the upcoming Pokemon Presents, which is set to air this Monday.
As you can see by clicking on the link below for yourself, PokemonSleep.com will now immediately take you to the webpage being used to promote Pokemon Day 2023, as well as the accompanying broadcast.
Interestingly, this isn't the only update the Pokemon Sleep website has received recently. When put through the Wayback Machine, an archive of the site from January reveals that the site was previously redirecting users to a patent for Pokemon Sleep, published November 17, 2022.
From this patent, we get more of an insight into what Pokemon Sleep will entail. The app will track our sleep patterns, rewarding us for getting enough hours of rest a day in the form of seeing a Pokemon grow and level up. It will also break our sleep into sections, telling us how much light, deep and REM sleep we get every night.
This patent was filed in August of last year, showing that the Pokemon team certainly hasn't forgotten about the project. Now, with this latest website update in mind, it seems all but guaranteed that Pokemon Sleep will be announced in Monday's Pokemon Presents. Either that, or someone has gone to a whole lot of effort to mess with fans over a relatively small announcement. Which I suppose you can't rule out.