There is certainly a gain. It’s an experience to wake up in a different reality as something or someone else. It can also help you sleep by providing a more appropriate sleeping environment. Some people live in noisy areas and light sleepers have trouble staying asleep. Sensory deprivation from a headset can help.
Yeah, I could see sensory dep or at least triggering the VR to start when the person’s stats show they are waking, but running a VR while asleep would probably be a bit over the top. Not sure how deep this kind of VR can work, however. If it could be used to stimulate and build (effectively) lucid dreams that would allow someone to interact with while asleep—that would be a whole other kettle of fish.
Basically, what I’m saying is that there’s no point making an interactive world be interactive when the person in it cannot interact.
a good way to explore the subconscious
Certainly would be a great way to use up power for no specific gain.