I'm not sure how safe this is, but with nraas error trap, overwatch and relativity together I have not experienced any problems whatsoever with my save game which I've been play testing nraas mods for over 8 hours today. The summary of this post is at the end in case you don't want to read any further.

This is how to do it:

Get Nraas relativity mod. It'll give you far more time to do things like shower, garden, socialize, travel, collect items, read books, learn skills and fill motives. The FAQ says it always takes 8 hours to sleep because the energy motive is disabled as a relative motive compared to the other motives, but I figured out a simple way around this when I played with the motive settings.

Mount a clock on the wall, then click it and click nraas then relativity...

For Relative Motives, change Energy to True. It's False by default, so that's why it progresses at a static pace unlike everything else. Relativity will not only reduce the clock speed, but it will hasten most processes proportionately except for their accompanying animations. For sleep, you can finish sleeping from tired to fully rested in under 20-30 ingame minutes!! Maybe even as little as 10-15. Quicker than a shower or a meal.

For set speed, interval is default. 0 is the default speed which is 37 game ticks per real-life second. If you change it to 1, the game will progress roughly 1 ingame minute per 37 real life seconds. Careful with this one, altering the speed lower than 10 game ticks per second can make some things slightly buggy, but if you change the speed back to default or about 19+ which is 50% speed, then this will quickly correct itself.

Enjoy super-fast sleeping! Especially useful when you're early in the game and do not have the moodlet manager OR if you have kids or teens who the moodlet manager does not work for and need their 8-9 hours of sleep.

I am so glad I managed to figure this out. I just wanna tell everyone. Lol I love Twallan's mods now. Twallan's Story Progression works excellent with Relativity. It reduces the performance hit especially when you lower story progression speed to 1 (snail) or 2.

Back up your save, test this out and tell me how it works for you. I'm not exact how much faster sleeping really is, but it's sonic-speed compared to the sluggish 2 minutes of waiting for sleep to pass. And it gives you far more ingame time during the day to achieve everything you want to do without waiting *forever.*

It works way more efficiently and far safer than using relativity to speed the game beyond the normal pace of 37 ticks per second which can potentially alter the integrity of story progression and cause all sorts of wonky things to occur with the town's population. Plus you can still use the speed settings and change the speed of the clock at will.

It should be much less laggy and resource taxing since much less happens with the sims in your town in 7-30 ingame minutes than 8 ingame hours.

Edit: quoting from the Relativity FAQ at https://nraas.wikispaces.com/Relativity+FAQ
"What is Relativity ?

The mod alters the flow of time in the game.

Reducing the relative speed in the mod will increase the real-time length of a sim-minute in game, while leaving the animations that sims perform unaffected.

This gives the sims more time to perform their interactions within the span of the sim-day.

To compensate for the change in the length of the day, all motive increases are altered in an inverse proportion (make the speed slower, all motives will increase faster), ensuring that they continue to raise at the same speed relative to real-time

What are Relative Motives/Skills ?

By changing the relative speed, you are altering how slow or fast the in-game speed flows relative to real-time.

However, the deltas applied to motives and skills are still based on in-game clock speed, not how fast time flows in real-time.

To compensate, a factor is applied to those deltas to make them appear as if they are changing at the same rate relative to real-time.

So, if you reduce the relative speed by half, all the deltas are multiplied by two.

The "Relative Motives" and "Relative Skill Gains" options in the mod determine which elements are adjusted in this manner.

By default Energy is not a relative motive. This means that energy does not increase faster when you are running on a slower speed. The sim will therefore sleep for eight sim-hours regardless of the relative speed you are running."

Therefore when you enable it as a relative motive, it will increase faster when you are running the ingame clock at a slower speed. That is basically the summation of this post.

This forum is for discussions about creating mods, not using them Feel free to post in Sims 3 Discussion, under Community (though I think you'll find that most folks know how to use Relativity).