Overview


Sleep Stages (very short)


  1. N1: very light sleep, easy to wake.
  2. N2: light sleep; most time is here.
  3. N3: deep sleep; body recovery.
  4. REM: vivid dreams; memory support.

Healthy sleep moves through these stages in cycles of about 90 minutes.

Good Sleep Habits


Sample Sleep Schedule


Weekday Plan (example)
Step Time Notes
Wind-down routine 9:30 pm Dim lights, relax, no screens
Bedtime 10:00 pm Read 10 min
Wake 6:00 am Expose to morning light
Aim for 7–9 hours for most adults.

Figure — Simple Sleep Cycle Sketch


Cycle 1: N1 ---- N2 -------- N3 ---- REM -
Cycle 2: N1 -- N2 -------- N3 --- REM --
Cycle 3: N1 - N2 ------ N3 -- REM ----
        

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