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The 4, 7, 8 breathing trick is very simple and very effective. What you do is breath in for 4 seconds, hold your breath for 7 seconds and breath out for 8 seconds. Rinse, wash repeat until you are asleep. Many people have reported success with this method and best of all it’s free! There are many articles about this breathing trick including this one . This is the simplest and most effective breathing trick for falling asleep that I have come across. It also is a good method for just relaxing if you are feeling stressed out. The basic science behind this breathing trick is that it forces your body to slow down your heart rate which then forces you to relax. Physiologically you have no other choice! Use it at the office when things get stressful or before presentations when you are nervous.