The 20-minute break applies to coming out. Allowing the mind to process the information. How much it can take in one sitting is quite amazing.
How effective combining multiple sleep session will be is a good question. More is not necessarily better. But it takes "research" to find out. I do suggest you keep a journal of when you listened, the combinations and any changes in you the following week. It may not be attributable to the Paraliminals alone given other life factors but if you find a mix that seems to works for you it makes it faster to use it again next time.
It also makes it easier to share your experiences with others.
One thing about sleep learning or any learning... give it breaks in between. Research shows sleep improves memory. If you are busy learning every night in your sleep when are you going to have the mind doing the integration? So like an exericse program I recommend a recovery time between sessions.
All things in moderation.
Alex
