Reasons Why You Only Sleep A Few Hours A Night

If you’re regularly getting fewer than five hours of sleep and don’t experience sleep deprivation symptoms, it may be due to a condition known as Short Sleep Syndrome (SSS), which is caused by a rare genetic mutation.

Sleep Deprivation

Sleep deprivation, or sleep insufficiency, occurs when you don’t get enough quality sleep to maintain your health, alertness, or performance. The National Sleep Foundation recommends 7-8 hours of sleep per night for adults, 8-10 hours for teenagers, and 9-11 hours for school-aged children.

Sleep deprivation can be acute, lasting just a night or two, and usually resolves after a few nights of rest. However, when it’s chronic, it can significantly affect your ability to function normally, causing symptoms like:

• Clumsiness
• Depression
• Difficulty learning
• Drowsiness
• Fatigue
• Forgetfulness
• Carbohydrate cravings
• Irritability
• Decreased interest in $3x
• Loss of motivation
• Mood swings
• Trouble concentrating
• Weight gain

Common causes of sleep deprivation include:

• Intrinsic sleep disorders: Conditions like insomnia, narcolepsy, sleep apnea, and restless leg syndrome.
• Extrinsic sleep disorders: Problems like food allergies, alcohol-induced insomnia, or poor sleep hygiene.
• Circadian rhythm disorders: Issues like jet lag or shift work syndrome.
• Parasomnias: Disorders such as sleepwalking or REM sleep behavior disorder.

Is It OK to Sleep 4 to 5 Hours a Night?

Not everyone who gets less than the recommended amount of sleep has a sleep disorder or shows signs of sleep deprivation.

However, a 2022 study in PLoS One found that adults over 50 who slept fewer than five hours per night had a 30% higher risk of chronic diseases compared to those who slept seven hours.

This risk increased with age, reaching 32% at 60 and 40% at 70. These conditions include:

• Diabetes
• Cancer
• Coronary artery disease
• Stroke
• Heart failure
• Chronic obstructive pulmonary disease (COPD)
• Chronic kidney disease
• Liver disease
• Depression
• Dementia
• Mental disorders
• Parkinson’s disease
• Arthritis

Short Sleep Syndrome (SSS)

In contrast to sleep deprivation, individuals with Short Sleep Syndrome (SSS) need less than six hours of sleep per night and still function well without any signs of sleep deprivation.

Those with SSS perform effectively at work or school and don’t need to catch up on sleep during weekends.

The cause of SSS is not fully understood, but genetics is believed to play a significant role.

A 2019 study published in Neuron found that individuals with SSS often have a rare mutation in the ADRB1 gene, which is linked to shorter sleep cycles and higher levels of β1-adrenergic receptors.

These receptors help regulate the body’s functions during the circadian sleep-wake cycle. In people with the ADRB1 mutation, this cycle is “reprogrammed” to perform necessary biological and hormonal changes within a shorter timeframe.

Further research is needed to fully understand this phenomenon.

Other Reasons for Short Sleep

Many factors can contribute to difficulty sleeping, including habits that disrupt sleep. Common causes include:

• Stress and anxiety
• Excessive caffeine or alcohol before bed
• Intense exercise before bedtime
• Late-night snacks
• Uncomfortable bedroom temperatures
• Loud or brightly lit environments
• Irregular sleep schedules
• Exposure to electronics or LED light before sleep