It took me a while, but now one of two things happen during my naps:
1) I don't ever fall asleep. So it's mostly just resting and relaxing with my eyes closed.
2) I fall asleep 10 minutes into the 30 minutes and wake exactly one minute before my alarm rings. My body somehow learned to do this, probably because the alarm sound is so painful. But I can tell that I wake up (I'm not sure who "I" is; it's more of a subconscious thing) right before I fall into a REM sleep.
1) I don't ever fall asleep. So it's mostly just resting and relaxing with my eyes closed.
2) I fall asleep 10 minutes into the 30 minutes and wake exactly one minute before my alarm rings. My body somehow learned to do this, probably because the alarm sound is so painful. But I can tell that I wake up (I'm not sure who "I" is; it's more of a subconscious thing) right before I fall into a REM sleep.