Tired, you make the arrangement to go to sleep. You have just dozed off in the comfort of your cozy bed, when suddenly you wake up with a jerk, with a feeling that you almost fell from a rooftop. Now you lay there wide awake thinking about the plausible reasons of the jolt. Was it some bad dream or some ghost pushing you off your bed?
Don’t you panic, you were just experiencing the phenomenon called Hypnic Jerk.
These jerks resemble the jump or jerk experienced by a person when startled, accompanied by a sensation of falling into the void. Other characteristic features are a rapid breathing, heartbeat, and sweating etc. These movements may or may not wake you up from your sleep. But if they do they are usually followed by a falling sensation or a brief mental image. The image is a kind of explanation that your brain gives for the jerk, for example, you feel that you were falling off a high building or perhaps kicking the football in your dream. Actually, these movements occur first and are followed by the explanatory mental image.
The Reason
The prominent parts of the brain involved are the located in the medial section of the brain and posterior to the optic nerve.
Reticular Activating System (RAS) –This is responsible for handling the wakefulness and keeping us alert.
Ventrolateral Preoptic Nucleus (VLPO) – This part influences our sleep cycle and starts to take over when we doze off.
Slowly as we go to sleep the breathing and heart rates slow down and body temperature drops. The muscle tone shift from alert to relaxed.
According to this theory, d
Other Causes
Sleep starts occur more often when the following factors are there:
i. Increased use of caffeine.
ii. Sleep deprivation
iii. Stress or anxiety.
iv. Strenuous evening activities
The hypnic jerks are common and nothing to worry about. So, the next time you experience the jerk, just roll over and go back to sleep because it is just your brain at conflict.
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