Don't know the energy value but never really looked, however, when I use the tents, (which I often do), there are never any issues like Sims have in a low quality bed. They wake refreshed, happy, (from being outdoors), and ready to go. Sims really seem to like the tents for many things, sleep, nap, read, relax, whoo hoo and try for baby. The only problem is if you have one on your lot they will often disappear into them to read the Wilderness Manual or relax.