Ah, yes…sleep. The magical, rejuvenating, blissful act of falling asleep. ZZZZZZ………*JERK*
What in the heck was that? One moment we’re drifting away to deep unconsciousness, and another we’re being jolted back into reality…how rude of us to do that to…us.
Has this ever happened to you? Turns out that it’s happened to most of us; for some people it occurs on an all-too-frequent basis. If you’re like most, you’ve probably wondered why this happens. Indeed, it is a strange (even frightening) spectacle.
That’s what our really shrewd friends in white lab coats are calling this phenomena: a hypnagogic jerk. The name is derived from the hypnagogic state – the transitional period between wakefulness and sleep. Hypnagogic jerks are often simply referred to as hypnic jerks.
Hypnic jerks generally involve sudden, erratic movement (i.e., twitches or spasms) of the arms, legs or entire body. Most often, hypnic jerks occur while trying to drift off to sleep. Interestingly, many people experience the sensation of falling immediately prior to sudden muscle twitches and abrupt awakening.
Has Your Body Ever Jerked Suddenly Falling Asleep? Here’s The Meaning Behind It…
Researchers are not entirely certain as to the physiological rationale of hypnic jerks, although there are plenty of accepted theories. Most scientists and physicians believe that these jerks simply result from the brain transitioning to a lower frequency. Our brains produce high levels of activity from the moment we awake to the time we begin to “unwind” in the evening; hence, it seems plausible that the brain will, at times, attempt to regain this natural state of activity.
Another common theory is how the brain responds to bodily exhaustion. More specifically, when we’re extremely fatigued, the brain will sometimes transition to the first stage of sleep too quickly instead of following a slower and more natural progression.
Normally, in the first stage of falling sleep, respiratory activity and heart rate slows down; the body “stills,” and our state of sleep is quite light. According to the defense mechanism theory, when our bodies reach this state too quickly due to exhaustion, the brain may interpret it as a threat and initiate a jerking response.
As for the feelings of falling? Scientists are quite confident these episodes result from the brain sensing equilibrium imbalance – a lack of stabilization. Ever leaned back too far in a chair and jerked forward to maintain balance? Felt faint when standing up too quickly? The brain can also signal the body to regain stability if it senses imbalance. Similar to the prior theories, this also is an involuntary defense mechanism of the brain.
We all need quality sleep to be productive. As mentioned, our brains send and receive massive amounts of information throughout the day – and sleep is necessary for the brain to allocate, organize, process and store this influx of information. Furthermore, sleep allows the brain to solidify and consolidate memories. This is particularly important when converting short-term into long-term memory. Hypnic jerks can disrupt our normal sleep pattern, especially when they occur on a regular basis.
Which leads to the question: can hypnic jerks be avoided?
The simple answer: yes and no. Apologies, as that isn’t really a simple answer. Here’s some elaboration. The human brain is a remarkably complex organ, producing stimuli that is sometimes unexpected (thus unexplainable). As is common knowledge, the brain normally operates at frequencies within certain ranges depending upon the activity at hand. These predictable range frequencies allow us to maintain a normal sleep/wake cycle, for example.
Sometimes, though, the brain involuntarily produces signals that are beyond normal, expected ranges of frequency. We experience these anomalies in a number of ways (e.g. daydreaming, losing track of time), including in our sleep/wake cycles. Jet lag is another common sleep disruptor caused by involuntary, erratic brain activity.
That said, there are a few things scientists do know. First, sleep deprivation is a trigger of hypnic jerking. Not getting the recommended amount of sleep (7-9 hours) on a frequent basis can lead to hypnic jerking. Pulling an all-nighter for work or studying is counterproductive and can result in jerking awake. Excessive consumption of alcohol or nicotine, especially before bedtime, can have us twitching ourselves awake.