There's also a technique called 4-7-8 that's supposed to work well.
Exhale completely through your mouth, making a whoosh sound. Close your mouth and inhale quietly through your nose to a mental count of four. Hold your breath for a count of seven. Exhale completely through your mouth, making a whoosh sound to a count of eight.
This works for me, also reading boring text books will make you sleepy as well, just like listening to a boring class. :o
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Thank you so much for share!
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I will try!
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