Have you experienced a feelin' of falling or twitching as you asleep? This is what they called hypnic jerks, an involuntary twitches in our arms and legs. This type of feeling is normal and it can happen before people enter the deeper stages of sleep. Based on the study, it can be caused by anxiety, caffeine, a dream or discomfort in sleeping. Me, I personally have experienced this especially when I'm tired..
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Madalas ko maexperience yan.