Experience on Rhythmic Napping

I woke up this morning at 6 A.M. and watched the first part of the Salt Cube video (37 minutes) to get into the lucid dreaming mood. After focusing on the rhythmic napping section, I went on to try it. It really takes a toll on you.. Especially during school days when all you get is those 6 hours of sleep before hand. The timer wakes you up almost every time and therefore the next 1.5 - 2 hours of sleep is not very restful and relaxing. When you finally finish with the rhythm timer, you're brain and body are pretty tired. Its taxing, but on the weekends it a little better because you can finish your sleep after the cycle of rhythm napping. Its really a killer.

Another interesting feeling/phenomenon that occurred when I used the rhythmic timer was a rush of tingling feeling throughout my whole body starting from my neck-ish area and flowing down through my body. This would occur when the timer would startle me awake and an instantaneous tingling feeling/rush would pass through my body. It would happen really quickly, but the feeling would linger in my extremities for a few more seconds. I wonder if this is part of sleep paralysis to keep the body still. It can be analogous to a wave of adrenaline sent through your body (if you've ever experienced that), but much more amplified. I wonder if its a wave of "sleep paralysis hormone" to keep your body paralyzed or something. Its a really crazy feeling, and almost like a cold feeling through your whole body. Crazy stuff.