I'm not sure if it's NSDR but my best naps are those where I'm not sure if I've been asleep or not. After lunch, I just put the mid day news on TV and close my

I'm not sure if it's NSDR but my best naps are those where I'm not sure if I've been asleep or not. After lunch, I just put the mid day news on TV and close my eyes while listening to the presenters.