circadian rhythm is a 24 hour rhythm.
your body goes through 90 minutes cycles of sleeping and wakefulness –
your energy is either increasing or decreasing – in this you have your 4 different brain wave states – alpha waves (when you are most awake) – beta, delta and gamma.
adenosine triphosphate helps you go to sleep
cortisol will keep you from falling asleep
3pm your body temperature dips – when you start to feel tired.
10am is when you feel most alert
Light exposure of sunlight in your eyes when you first wake up. Lunchtime 15 mins walk outside, light enters into your hypothamuls which releases serotonn – improves your mood and wakefulness and alleviates depression.
No electronic lighting at night. Use candles. If you use light your brain gets confused.
Download this free program f.lux for computer and Twilight for Android. Both are free.