Have tried binaurals 10 years ago with good success, but stopped. Recently started meditating and giving it another go. The 20 minute nap worked like a charm. 

Have you experimented with polyphasic sleep and listening to  binaurals whilst napping?
I haven't, but another viewer recently told me he uses these tracks numerous times throughout the day to help him along his polyphasic way!
Neels Hattingh