Sim is always tired, even after sleeping

Hi! Recently I added a new member to my household but I've noticed she's exhausted from low energy, which also makes her uncomfortable.

She is a young adult. The first time I noticed this, I had her go to sleep but this issue is still persisting, and she is only getting more and more tired! I even made her sleep like 10 times in a row, back to back, and her energy did not go up at all! I made her sleep 3 times in a row but all those times COMBINED only lasted like 15 in-game minutes! Currently it says she's going to pass out in 3 hours even though she has just slept numerous times.

Update: She only slept just long enough to get back up, while my other sim was sleeping through the night just fine. Then she passed out and is just standing next to the bed.

Another thing I find odd is that often her mood will be energized because she just took a nap, but her energy won't actually go up or be high at all.

If anyone has any suggestions I could try, it would be greatly appreciated, thanks so much 🙂