The second (inner) one is more balanced in terms SWS and REM potential, and may allow for a more complete repartitioning. However, 2.5-hour cores increase the likelihood for SWS wakes, which increases the chance for oversleeping, especially in the first core. For some, waking up from SWS and/or REM is extremely challenging and best avoided. This variant may be better for those needing more REM than SWS. Adapting to this variant may eventually result in 4 sleep cycles of ~75 minutes. However, this is mostly hypothetical and requires more data to confirm.
