It's insane how fast the needs in Sims 2 go down! I mean, they barely have time to do anything before needing to go right back to sleep, or pee, or eat, or shower when they just woke up, peed, ate and showered five freaking Sim minutes before.
If you have FreeTime or The Sims 2 Ultimate Collection, I believe there are Lifetime Aspiration Benefits you spend points on that can slow the need decay. Some of the benefits from Primary or Secondary Aspirations can also slow the need decay.
I'm not sure if there's a Mod that slows need decay.
As WinMacSims3 said FreeTime and Aspirational Points really help with that a lot. Also if you have Seasons growing fresh veggies and fruits make sparkly food which brings hunger up really fast. Also it's best to top their needs to full as it decays slower but if your not topping them all the way full they decay faster. (just what I hear/read about) So full nights rest don't queue anything up because once energy if full they will wake up immediately (even if 2am) then they will struggle all day and constantly want to sleep mid day.
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I'm not sure if there's a Mod that slows need decay.