Hi
I recently installed Ultimate Collection, played it only Maxis for a while , then slowly introduced my CC in, objects first, bodyshop next and hacks last. I added things in groups, as updated as I could manage (I run only up to Pets on other computer) and run hack checks too, nothing found.
But funny thing happens. If a sim gets to about only 10% of energy, I can't put him/her to bed, it only shows relax option. To prevent Sim to die on me out of exaustion, I must put them to nap at the nearest sofa, where they remain napping for a short while with energy bar raising ever so slow, then get up in about a hour or so of Sim time, still super tired and crying for bed. I have to repeat that process 2-3 times till they get to about 20% of energy and then bed becomes sleep-selectable and I can send them to sleep in it. It's so akward, they pass half of night napping around and not resting at all. In my non UC game, I could drive them going up to being red in energy and send them to sleep without any problem, any time I wanted.
I am sure some of hacks (that I perhaps failed to update from Pets to AL) is doing this, but I can't guess which it could be; I tried saving game in those conditions and doing 50-50 method, but I failed to find the guilty one.
Any ideas? Thanks

You will need to upgrade all mods/hacks to AL/M&G or this is the problem you will have.
All your old mods are for Pets EP and some will work but a lot will not work in later EP game.

That I did, and I did not pass over several hacks that were dubious if they had update for upper EP (only if I by mistake skip some)

Either you missed one or you have a conflict between 2 or more.

HCDU program may help you Sims 2 Hack Conflict Detection Utility http://www.simwardrobe.com/