Hi in what category is this function ? I can'tfind any reference for it ....

http://www.creationkit.com/SetPCSleepHours

Hmm the Wiki has almost no helpful information so its either a console only command or a very specific quest function.
I have never seen it in the Papyrus section so it might be a console only command like SetLevel().

It says at the bottom of the page: "Category: Console Commands."

Ok so is not possible ot use in scripting?

As Dreamking says it's clearly described as a console command. Anyway, if you want to force player sleep, you could use game.fasttravel() fuction. First to a distant point and then to the current spot. The problem would be to determine where you put the markers to advance the desired time, but a little trial error should be enough.

You could use the function game.fadeoutgame() to make a fade to black effect when the goes to sleep and use the same function to reverse the effect. That way, the player won't see the first travel spot.

That doesnt work because it states that it doesn't register time for travel but instatravel instead ...

No it doesn't. I just tested it ingame using it to fasttravel from whiterun's CoC maker to a NPC in the area between Battleborn farm and the ritual stone and more than an hour has passed.

I think you mistaken not autosaving with no time passing.

It works for Standard Skyrim terrain and in worldspace to same wordlspace terrain but I meant to transfer from a worldspace to another so like from skyrim to Sovngarde for example ...

Could you then force the player to fast travel twice, once within the same worldspace to force time to pass, and then again to the new worldspace?

thie means From A ( worldspace A ) to B (Tamriel) to C ( Tamriel ) to D ( Worldspace D ) making two load screens happen and lot longer time to load ... and not sure if is even worth ... why they just coudlnt' enable pcsetsleep ...

Exactly. Indeed you could use a moveto for the first travel, to ensure that a unexpected circumsance didn't make that fasttravel make the time pass.
More like From A to A (just to make time pass) and then to B. But yes, this would be easier should they have include a function to force sleep.

I guess I will skip for now adding all this complicate and timeconsuming technique and just allow for a normal sleep time , perhaps with Dawnguard they will add this sleep function ... perhaps for the Vampire resting stuff dunno ....

But it's not time consumming. The load times of both fast travels mean to make the time pass ending in the same place, will equate more or less the time you would spent sleeping and the world change moveto will be needed anyways. Keep also in mind that not everyone will buy Dawnguard.

No but they will force the update on compatibility , meaning install on the CK of the needed functions I guess no?