As a result, the transition from wakefulness to sleep may feel less gradual.
Someone who has stayed awake late for several nights, worked long hours, or experienced an unusually exhausting day may notice more pronounced sleep starts.
For example, imagine a person who normally goes to bed at 11 p.m. but stays awake until 3 a.m. for several consecutive nights.
When that person finally lies down, they may fall asleep rapidly and experience sudden muscle movements during the initial transition.
This does not mean that sleep deprivation always causes hypnic jerks. However, inadequate sleep can be an important contributing factor.
Maintaining a consistent sleep schedule and allowing enough time for rest may help reduce their frequency.
2. Stress, Anxiety, and Mental Tension
Stress can influence the nervous system even after someone has physically gone to bed.
When people experience anxiety, work pressure, financial concerns, or emotional difficulties, their bodies may remain in a heightened state of alertness.
The heart rate may remain elevated, muscles may feel tense, and thoughts may continue racing despite attempts to relax.
This can make it more difficult to transition smoothly into sleep.
Some people notice that hypnic jerks become more frequent during stressful periods.
For example, someone preparing for an important examination or dealing with a demanding work project may experience repeated body twitches when trying to fall asleep.
Stress can also create a cycle.
A person experiences a sudden jerk, becomes worried about it, and then starts anticipating another movement. This anticipation increases anxiety, making relaxation more difficult.
The result may be a frustrating bedtime experience.
Relaxation techniques, breathing exercises, and a consistent nighttime routine can help reduce mental tension before bed.
3. Caffeine and Other Stimulants
Caffeine is a stimulant that affects the central nervous system.
It is commonly found in coffee, tea, energy drinks, soft drinks, chocolate, and certain medications.
Caffeine can increase alertness and make it more difficult to fall asleep, particularly when consumed later in the day.
Because it can remain in the body for several hours, drinking coffee in the late afternoon or evening may affect sleep even when someone does not immediately notice its effects.
Some individuals are more sensitive to caffeine than others.
For these people, even a relatively small amount may contribute to restlessness, difficulty falling asleep, or a heightened sense of physical alertness.
Energy drinks may be particularly relevant because some contain substantial amounts of caffeine.
Other stimulants, including nicotine and certain prescription medications, can also affect sleep patterns.
People who frequently experience hypnic jerks may benefit from observing whether their symptoms occur more often after consuming caffeine or other stimulating substances.
Reducing caffeine intake in the afternoon and evening is a practical starting point.
However, people who use prescribed stimulants should not stop or change their medication without discussing it with their healthcare professional.
4. Intense Exercise Close to Bedtime
Regular physical activity is generally beneficial for sleep.
Exercise can improve cardiovascular health, reduce stress, and support a healthy sleep-wake cycle.
However, very intense physical activity immediately before bedtime may leave some people feeling physically activated.
After a demanding workout, the body may need time to cool down, restore its normal temperature, and return to a more relaxed state.
Some individuals notice that their sleep becomes more restless when they perform intense exercise late at night.
This does not mean that evening exercise is inherently harmful.
The effect depends on exercise intensity, individual sensitivity, and the time between the workout and bedtime.
A gentle walk or stretching session may help some people relax, while a high-intensity workout immediately before lying down may make it harder for others to settle.
People who notice a connection can experiment with moving demanding workouts earlier in the day.
5. Irregular Sleep Schedules
The human body relies on an internal timing system known as the circadian rhythm.
This system helps regulate sleepiness, alertness, hormone release, and other biological processes throughout the day.
When someone frequently changes their bedtime, wakes up at inconsistent hours, or works rotating night shifts, the body's internal timing can become disrupted.
Irregular sleep schedules may contribute to difficulty falling asleep and poorer sleep quality.
They may also increase the likelihood of sleep disturbances in people who are already susceptible to hypnic jerks.
For example, someone who sleeps at midnight on weekdays but stays awake until 4 a.m. on weekends may struggle to maintain a stable sleep pattern.
Establishing a relatively consistent bedtime and wake-up time can help support the body's natural sleep rhythm.
6. Certain Medications and Substances
Some medications and substances can influence nervous system activity or interfere with normal sleep.
Depending on the medication, effects may include increased alertness, restlessness, muscle movements, or changes in sleep quality.
Examples may include certain antidepressants, stimulants, and other medications that affect the central nervous system.
However, the relationship between a specific medication and hypnic jerks varies from person to person.