On 64 bit Windows I noticed I could not put the computer in sleep or hibernate mode with the game running. Not even when it is just in the main menu. Can anyone else confirm this problem, I'm not sure if this bug is also in the full game?

I don't mind it much on PC but for a laptop this can be quite an issue.

I've never heard of any game or real-time activity for that matter possible to be run during sleep or hibernate mode. Why would you want that? Just save and quit the game.

I understand this is not the most usefull thing on a PC but I always test it in case I end up playing on a laptop. Most games can actually work just fine when restoring from sleep (and sometimes you just need to switch from exclusive fullscreen to borderless-windowed). I have also never had a game or any other real time task that prevented hibernation like this (on my personal computer).

I can sketch up a scenario where this can be a problem though: you alt tab out of the game because of a notification or something. You lock your laptop and go away for a bit. You return to your still locked laptop and did not think about the game as it isn't visible and folded it shut to pack up. Ordinarily you'd expect it to go to sleep. Now it will just screw your battery.

I don't expect every game handeling hibernation gracefully, and if it goes wrong, whatever its just a game. But it is a bit annoying when a game just changes or somehow interferes with the power management of your actual device for no apparant reason.

I can also imagine a few reasons why this is happening right now, just guessing of course. Two that could be intentional is 1) they prevent sleep so it won't interfere with the demo's killscreen to end the session otherwise people could rewind clocks. 2) during earlier testing they had problems that only happened after running the game after a long while so they added some code that prevents the computer from sleeping (while the tests are running) and it ended up in the demo. So I'd like to know if it is just a random bug or a choice and how it impacts the full version of the game.

Edit: tested the demo some more. When first launching the title screen and main menus all allow sleep mode. After loading any kind of mission it becomes unable to enter sleep mode. (It only briefly tells my monitor to go to sleep to then immediatly wake it again.) Even exiting to the main menu will not allow sleep mode.

This makes it a bit less unfortunate for laptops if the game launches with a delay, for example when something like Galaxy is applying an update and launches it afterwards as now you'd first have to actively load a mission or savegame for it to interfere.

1) they prevent sleep so it won't interfere with the demo's killscreen to end the session otherwise people could rewind clocks.

Most likely this, intentionally or otherwise.

But what's the main purpose to be able to leave the game on in sleep mode? Is it because you forget it and don't have it in the charger or you want to save time not having restart it?

Again I don't really care about what happens to the game itself in sleep mode. If I forgot to save: I forgot to save and it's my dumb fault. I do care about my laptop being able to sleep when neccesary. Also with how annoyying Windows 10 has become with stealing focus (even from exclusive fullscreen applications) for useless action centre notifications it is entirely too easy to forget it was running.

I guess some other people had problems with the load times (there is even this extra warning on the load screen?) but I didn't run in to that on my PC, probably because of SSDs. I don't expect games to run well on my laptop anyway, it is not a gaming laptop in any sense (but I did specifically pick one with a more serious AMD/NVidia mGPU at the time because Intel's graphics didn't cut it then) but I do want it to be able to just use the power settings I configured.

(The dev should still really look into making their own streaming file system/packaging as some of the other topics suggested though!)

This sounds like too much trouble. I would just keep the laptop in the charger and when you are done, stop playing and the laptop can go into sleep mode without hassle.