Hi Peter. firstly how many days are you on the your polyphasic sleep?
I am currently on day 13.
I don't have a problem falling asleep, but what you can try is including some down time before a nap like listening to some slow paced music with your eyes closed. When you go to sleep ensure that your sleep environment is as dark as possible, you can even try putting on a blindfold I found this technique helped a lot when I started.
In response to not recalling if you slept or not, it is easy , if you don't feel like you where laying there awake for the whole 25 minutes then you where definitely sleeping. You must remember that your sleep process is now totally different that before. I can remember my first lucid dreams, it doesn't seem like dreams at the time, it is more than when you wake up you think that you where just thinking of something only to later realize that you where not just thinking of things but seeing it as well meaning that it must have been lucid dreams. It is very weird in the beginning as you can start dreaming even before you sleep. Now when I go to sleep I just close my eyes and while awake I wait for my dreams to start and as I watch my dream I drift into sleep.
I have no answer about the snoring thing, it can be because even though you don't realize it your sleep sessions is more intense, try sleeping in different positions.
I am currently experiencing the same problems in my energy levels at night times. It sometimes takes me up to half an hour just to get to a fully awake state. To assist in the wakening process I undertake a physical task that doesn't require much brain power like washing the dishes. The worst problem I am experiencing at the moment is eye soreness because of to many hours in front of a computer.
Feel free to read my blogs at
Vuurstomr's Blender 3D there may be some posts that you can find useful. Also follow the "Post your polyphasic sleep logs here" posts where we usually do you sleep updates.
I also plan to start a polyphasic sleeping guide with tips and tricks, any advice you have will help others also attempting polyphasic sleep.