>>Do you set alarms for these naps? I know someone who takes these all the time and says he just automatically wakes up in 15 minutes, 20 minutes or whatever.<<
No, I wake up naturally. Like the other day, I went into a deep comatose sleep. Minutes before I wake up, I feel a tingling sensation in my brain as I come out of comatose, and my brain is reset. I was only out for 15 minutes!