^^ Both of these are answered by sleep cycles.
When sleeping, you go into REM cycles approximately every 90 minutes. Each cycle is longer than the last. So your first few REM cycles (through the first few hours of sleep) are short with long intervals of deep sleep in between. But toward the end of your sleep period the cycles are getting quite long, so that shortly before you wake up you're essentially in almost one continuous REM cycle. This is the prime time for lucid dreaming, one reason being if you're going to do a wake back to bed technique (which are very effective), you want to make sure you've already had at least 4 or 5 hours of good sleep, in case you can't fall back asleep (which happens sometimes).
As for the timeframe for napping - apparently your REM cycle remains active for a few hours after you wake up, so that if you tale a nap during that period you can fall directly into REM without needing to wait 90 minutes. But after a few hours of being awake the sleep cycle resets, and then if you go to sleep or take a nap you'll need to wait the 90 minutes.
|
|
Bookmarks