As a sleep researcher is monitoring you, he notices that your brain waves are showing almost all delta waves. he awakens you at this point, and you awaken in a complete state of confusion. you are most likely in which stage of sleep?

Stage 4 of NREM

There are 5 stages of sleep. The first four are under NREM and the last stage is REM. At stage 4 of NREM, the person can have deep sleep and brains continuously producing delta waves. If the person was aroused at this stage the person will feel disoriented upon waking up. This is the last stage of NREM. This will be followed by the REM or the stage where there is rapid eye movement even when the eyes is still closed,

Fossil found in strata reveal that unused body part decrease in size