1. What is the boundary between a nap and the beginning of a night sleep?
2. Does the time of day influence this?
3. If I skip a night of sleep, will the following night result in directly heading into REM(like in a nap), as opposed to an average night where that doesn't happen?
4. If I take sleeping sessions of 2 hours or so each in a night with several minutes of activity between each session, will each session after the first take me directly into REM?
5. How do I perform SSILD effectively?