Other times, the spasms can be strong enough to startle the person and wake them up. The authors of a study noted that hypnic jerks occur randomly and affect both men and women of all ages. The researchers found that 60 to 70 percent of people experience hypnic jerks, usually just as they are about to fall asleep.
In most cases, there is no clear cause of a hypnic jerk. They occur in most people without any underlying explanation. With that said, there are some ideas and theories about why these sleep starts occur. Possible reasons may include:. Exercise : Exercising stimulates the body, so exercising late in the evening may make it more difficult for the body to relax in time for sleep.
This excess stimulation may cause a hypnic jerk. Stimulants : Body and brain stimulants, such as caffeine, nicotine, or some drugs, may make falling asleep or staying asleep throughout the night difficult. They may also increase the frequency of hypnic jerks. Stress and anxiety : A high-stress lifestyle or feeling very anxious can make it difficult to relax in preparation for sleep.
An alert brain may be easier to startle, so a person may be more likely to wake up when these involuntary muscle twitches occur. Poor sleep habits : Irregular sleep patterns, sleep deprivation , or regular sleep disturbances may lead to hypnic jerks. Sleep starts can happen in people of all ages. However, the American Academy of Sleep Medicine note that adults are more likely than children to complain about frequent or intense hypnic jerks.
The reason for this may be that many of the factors that sleep specialists associate with sleep starts are not generally relevant to children, such as:. However, this does not mean that hypnic jerks are not possible in younger children or that they indicate a problem. They may simply be less common in people of this age. It is possible to wake up from a hypnic jerk, but this does not always happen, as the strength of the muscle contraction that a person experiences will vary.
Some people only have minor hypnic jerks and are very unlikely to wake up because of them. They may only be aware that they experience hypnic jerks if a partner or caregiver notices them. In other cases, a muscle contraction may be significant enough to shock the person awake.
The strength of the contraction itself or the unsettling feeling that the person has from moving so quickly could cause this. In some cases, these large contractions can make a person feel as though someone else is pushing them off the bed.
The other symptoms of a hypnic jerk may also wake the person up. Baby wearing can offer many benefits for caregivers and babies alike. We explore the benefits, plus offer safety tips and a guide to the different…. After a few months of your little one staying pretty much where you put them, you may lay them on their play mat and find them halfway across the room.
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Health Conditions Discover Plan Connect. What is this sleep twitching? What causes twitching in sleep? When is twitching in sleep a concern? Parenthood Baby 06 Months. Read this next. Since many sleep disorders become manifest in an unusual degree of motor activity, this clinical basic-research project focused on determining normal levels of movement. The test subjects were pre-selected by a market research institute on the basis of a questionnaire interview. This was followed by a detailed interview about medical aspects of sleep at the University Clinic for Neurology in Innsbruck so as to exclude people with clinically relevant sleep disorders such as difficulty falling asleep or sleeping through the night, restless legs syndrome, sleepwalking, acting out dreams, narcolepsy or other illnesses involving an excessive tendency to fall asleep during the day, disturbances of the sleep-wake rhythm or indications of breathing disorders during sleep.
At the sleep laboratory they were then wired up in accordance with the current state of the art. This makes sense, as they might otherwise endanger themselves and others while acting out dream content.
During REM sleep dreaming and non-REM sleep, several muscle twitches per hour were recorded in healthy individuals — with a greater number in men than in women.
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