United News International (UNI)- Parts of the brain may not be fully unconscious while under anesthesia.

-That’s according to a new study published Sunday, July 1 by researchers at the University of Turku in Finland.

Researchers tested 47 subjects by putting them under using either propofol, a general anesthetic or dexmedetomidine, a sedative — and then attempting to rouse them.

The study found about half of the participants under the sedative were responsive to being shaken or yelled at even when under a constant flow of anesthesia.

More surprising was discovering 42 percent of those given propofol could be woken into a groggy state.

Researchers monitored and recorded the brainwaves of the participants throughout the experiment and found that while they didn’t feel pain, their brains were still responsive.

One study member said anesthesia may resemble normal sleep more than previously thought.

Almost all of the participants reported dream-like experiences that were mixed with reality.