Revision 3 (2018-01-28)

Start with a video by Matthew Walker - Why We Sleep.

Then you can read the Sleep Smarter and The Power of When books and/or watch their corresponding videos:

The goal of sleep hygiene is to avoid mistakes of not acting in accordance with your biological circadian rhythm. In the order of decreasing importance:

  1. not setting aside 7-9 hours just for sleep (with late stimulating activities and early alarm clocks)
  2. allowing noise and light during your sleep
  3. getting too hot or cold during sleeping - not adjusting your socks, pyjamas, covers and room temperature
  4. going to sleep and having meals at different times each day
  5. receiving too much artificial light after the sunset
  6. receiving too little sunlight during the day, especially right after waking up
  7. stressing your mind and body in the evening, instead of the morning
  8. napping and consuming caffeine or nicotine
  9. drinking alcohol and lots of liquids 4 hours before sleep
  10. not having a glass of water right after waking up
  11. not having a nutrient rich, low carbohydrate diet
  12. using your bed for anything other than sex or sleep

The first four mistakes are the direct physical reasons of a bad sleep. But they are non-negotiable items to ensure about your bed time.

The 5th, 6th, 7th and 8th mistakes are which you must also start understanding. Either you plan your day time to avoid them or you will wake up groggy, no matter the duration you were asleep.

Avoiding the last four mistakes is also proven to improve your sleep.

Revision 2 (2016-09-17)

During the whole day (between waking up and getting to sleep):

  • do recurring activities everyday at the same time, most important ones are wake up, meal and going to bed times
  • do not use the bed
  • make sure the bed matress is neither too soft, nor too hard
  • make sure the bedroom receives as much sunlight as possible
  • receive as much fresh air and sunlight as possible
  • set aside 8h for purely sleep time
  • do not consume stimulating substances (i.e. caffeine, nicotine, etc.)
  • do not sleep or nap
  • begin the day with only stimulating activities, gradually transform into doing calming activities, and end only with them
  • do not avoid planned daytime activities, even if feeling tired
  • if working 8h in an office, do at least 10min break outside (e.g. go buy groceries for lunch)

After wake up:

  • wake up
  • immediately #1: get sunlight (e.g. open curtains, go outside)
  • immediately #2: go get a glass of water (e.g. from the tap, bottle, well)
  • immediately #3: have at least 10min exercise
  • immediately #4: have breakfast

Before sleep:

  • as early as possible: ventilate the bedroom with at most 21°C fresh air (e.g. turn on AC, open all windows)
  • at least 5h before sleep: have at least 10min exercise
  • after 18:00: take as little foods or fluids as possible
  • after 18:00: receive as little light as possible (e.g. bathroom lights, electronic screens)
  • just before #5: write a journal entry
  • just before #4: prepare the clothes and other things for tomorrow
  • just before #3: make the bedroom as dark as possible (or wear eyemask)
  • just before #2: make the bedroom as silent as possible (or wear earplugs)
  • just before #1: get into bed on the back without a pillow, with socks and covers (or also pyjamas) that surely get you warm and cozy
  • just before #0: if not feeling sleepy, then relax: have sex, read a book or meditate (e.g. deep breathing and listening, or Headspace -> Singles -> On-the-go -> Sleep #2 meditation, or direct the mind to the body, think about how it feels, think through the day from start to finish in 30s, scan the body from bottom to top, all the time switching off the muscles, start counting down from 1000)
  • sleep

Revision 1 (2013-10-31)

This is my personal, unprofessional, work-in-progress review of various laymen literature about improving sleep, the most important activity.

Sleep hygiene is a collection of habits that help you to have a good night’s sleep. Most bodily processes (such as temperature and brain states) are synchronised to this internal 24-hour physiological clock, called “circadian rhythm”. The goal of sleep hygiene is to stabilize the circadian rhythm.


  1. Sleep in a bedroom that feels restful (dark, quiet) and comfortable (not too soft and not too hard bed matress softness, a cool air temperature, enough blankets to stay warm) is hygienic.
  2. Go to bed, when feeling tired and sleepy.
  3. Get enough sleep - sleep until you wake up without an external cause.
  4. Have a strict routine - work, exercising, meals, drugs, chores, other activities and sleep.
  5. Maximise your time being exposed to sunlight.
  6. Make your mind associate bedroom place with sleeping activity.
  7. Do not drink liquids before bedtime, otherwise you will wake up during the night to go to toilet.
  8. Physically and spiritually relax before bedtime.
  9. Do not fall asleep at daytime.
  10. Address the causes of sleeping problems, not the symptoms.
  11. Exercise every day, first when melatonin secretion stops and second when the greatest cardiovascular efficiency is.

Advice for requirements implementation

  1. Go to bed and get up at the same time every day. (4)
  2. Invest in a mattress that is neither too hard nor too soft. (1)
  3. If you can’t control noise (such as barking dogs or loud neighbours), buy a pair of earplugs. (1)
  4. Use your bedroom only for sleeping. (6)
  5. Do not use sleeping pills. (9, 10)
  6. Begin your day with only stimulating activities, gradually transform into doing calming activities, and end only with them. (2, 5, 8)
  7. Don’t take naps. (9)
  8. Do not use an alarm clock. (3)
  9. Use heavy curtains, blackout shades or eyemask to block out early morning light and any lights during the night. (1, 3)
  10. Do not avoid planned daytime activities, even if feeling tired. (2, 4, 5)
  11. If lying awake (for 20 minutes, if not morning), leave bed. If not morning, then do a calming activity in another dark and quiet room. (2, 6)
  12. Exercise on the first (before breakfast) and the third (90 minutes after dinner) quarter of every day. (11)
  13. If you tend to take your problems to bed, try writing them down—and then putting them aside. (8)
  14. Do office breaks in direct sunlight. (5)
  15. The first thing to do after getting up - raise curtains to let in the morning sunlight. (5)
  16. Don’t sleep with pets or children. (1)

Calming (Boring) activities

  1. Consciously relaxing and stretching every part of your body, starting with your toes and working up to your scalp.
  2. Thinking of a restful scene.
  3. Concentrating on the rhythmic rise and fall of your breathing.
  4. Focusing on a mantra (repeating a word or phrase constantly).
  5. Eating a light and mild snack with amino acids (especially tryptophan and complex carbohydrates (oligosaccarides, polysaccharides).
  6. Sitting quietly on the couch with the lights off and a cup of caffeine-free tea.
  7. Reading something boring, like a telephone book.
  8. Joga.
  9. Deep breathing.
  10. Listening to a relaxing audio.

Stimulating (Interesting) activities

  1. Working mentally (includes thinking about problems, including sleep).
  2. Working physically (exercising).
  3. Using stimulant (cigarettes), caffeinated (some teas, coffee, cola, chocolate) and depressant (alcohol) drugs.
  4. Looking at the clock.
  5. Eating heavy and spicy meals with fatty acids.
  6. Watching LCD, CRT, LED, projector and other displays.
  7. Reading something interesting, like a good book.
  8. Listening to an engaging audio.

Caffeine-free teas

  1. Peppermint.
  2. Chamomile.
  3. Ginger.
  4. Red rooibos.
  5. Mint.
  6. Lemongrass.
  7. Hops.
  8. Lemon balm (melissa).

Final remarks

  • Sleepiness is only when your eyelids are drooooping.
  • Common sleeping problems (such as insomnia) are often caused by bad sleep hygiene reinforced over years or even decades.
  • Sleepiness is associated with a drop in body temperature.
  • Doing a two-week course of writing a sleep diary with how the requirements are fullfilled can be useful in getting the right facts about your sleep.
  • Carbohydrates are not essential nutrients, because they can by synthesized from amino acids and fatty acids.
  • Do not eat simple carbohydrates (sugar) - monosaccharides, disaccharides - at all.
  • Eat more vitamins and dietary minerals.
  • Sleep inducers include tryptophan, valerian.
  • Tryptophan works by increasing the amount of serotonin, a natural sedative, in the brain.
  • Carbohydrates facilitate the entry of tryptophan into the brain.
  • Vitamin B6 helps convert tryptophan to serotonin.
  • A hormone produced by the brain, melatonin is instrumental in regulating the body’s sleep-wake cycle.
  • Light is important for the body to produce melatonin which is a sleep promoting substance.
  • Sunlight early in the day is particularly helpful in synchronising your body clock.
  • Warm hands and feet are particularly important.