The 4-7-8 breathing method works in cycles. Each cycle starts by exhaling with lips parted slightly, so breathing out makes a 'whoosh' sound. Close lips and inhale silently through the nose while counting to four, then hold that breath for seven seconds. Make sure the exhalation, with the whooshing sound, lasts for eight seconds. This method should be practiced frequently to complete the cycles mindlessly. Most people feel sleepy after four cycles.
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