The Science behind your observation
Why this works so well is because this is a peak time for dreaming (and remembering). Throughout the night our sleep cycles from wakefulness to deep, regenerative sleep, then back towards wakefulness and back down again and so on. Each cycle has a non-REM and a REM (Rapid Eye Movement) phase. The non-REM phase is further divided in 4 stages that take us from wakefulness to deep sleep and back again.
The first cycles of the night are shorter on REM and longer on deep sleep periods. This trend reverses as the night progresses with longer REM (eye movement, more shallow, rapid, irregular breathing, muscle paralysis, increased heart rate, blood pressure and penile erections ) periods and shorter deep sleep phases. By morning you are spending almost all your time in stages 1(drowsiness),2 (light sleep) and REM with very little deep sleep (stages 3 and 4- delta waves, interspersed with smaller, faster waves, no eye movement or muscle activity). If you've been woken from deep sleep, you'll feel groggy and disorientated.
"A dream is a question, not an answer."
(Therapist and dreamworker Strephon Kaplan
Williams)
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