Napping has been a point of minor-controversy for some time with some claiming they love napping to rejuvenate, while many others claim they only feel even more tired after a nap. 

The truth is, it’s all based on time. If you nap longer than around 30 minutes your body begins deep sleep, so when you wake up not sleeping a full night’s sleep you feel groggy and even more tired.  explains it all in this short educational video.