A good night’s rest isn’t guaranteed for anyone, but it is downright elusive for many people with autism. Individuals on the spectrum often have trouble falling and staying asleep.
And that may worsen certain features of their condition, such as repetitive behaviors, which can, in turn, make sleeping even more difficult.
Given this disruptive feedback loop, sleep problems are among the most urgent concerns for families grappling with autism. But so far, this also happens to be among the least-studied aspects of autism.
A 2019 study, one of the largest to investigate the prevalence of sleep problems in autism, suggested that nearly 80 percent of autistic preschoolers have disrupted sleep. Sleep problems are twice as common among children with autism as they are among typical children or those with other developmental conditions.
What types of sleep problems are common in autism?
People with autism tend to have insomnia: It takes them an average of 11 minutes longer than typical people to fall asleep, and many wake up frequently during the night. Some people with the condition have sleep apnea, a condition that causes them to stop breathing several times during the night.
Sleep in people with autism may also be less restorative than it is for people in the general population. They spend about 15 percent of their sleeping time in the rapid eye movement (REM) stage, which is critical for learning and retaining memories. Most neurotypical people, by contrast, spend about 23 percent of their nightly rest in REM
Autistic children may be more likely than their unaffected siblings to carry mutations in genes linked to sleep.
The findings offer a genetic explanation for why many children who have autism struggle with sleep, says Rackeb Tesfaye, a graduate student in Mayada Elsabbagh’s lab at McGill University in Montreal.
“There’s a theory that autism is a biological rhythm disorder, but there’s very little research in terms of genetics to validate that,” she says.
Autistic children are nearly twice as likely as their unaffected siblings to carry mutations that impact one of the sleep genes, and 2.5 times as likely as children in the general population. They are 1.5 times as likely as their siblings to have mutations that affect an insomnia gene. And they are 1.7 times as likely as children in the general population to have a deletion in one of these genes.
There is mounting evidence that too little sleep can exacerbate autism features, such as poor social skills. Children who do not get enough sleep often have more severe repetitive behaviors and a tougher time making friends than other people on the spectrum. They also tend to score lower on tests of intelligence. However, it is unclear whether these problems stem from poor sleep, contribute to it or both.
One 2009 study found that children with autism who have sleep difficulties are more hyperactive and easily distracted than those who sleep well.
Why do people with autism have difficulty sleeping?
Many people with autism have other conditions, such as gastrointestinal problems, attention deficit hyperactivity disorder(ADHD) or anxiety, and each of those is known to disrupt sleep. Cramps from constipation, for instance, may keep a person with autism up at night. Sensory sensitivities to light, sound or touch may contribute to difficulty sleeping. Sleep problems may also be an indicator of depression in autistic people, though whether it is a cause or a result of sleep difficulties is unclear.
People with these other conditions may also take medications that affect sleep. For example, many people with ADHD take stimulants, which are known to cause insomnia.
In some cases, people on the spectrum carry mutations that make them prone to sleep problems. Studies suggest that individuals with autism are more likely than typical people to have mutations in genes that govern the sleep-wake cycle or those that have links to insomnia. Some studies suggest that people on the spectrum carry mutations that affect levels of melatonin, a natural hormone that controls sleep.
Are there treatments available to help people with autism sleep better?
In some ways, the fix can be straightforward: Establishing a routine, such as an order of activities at bedtime, can often help a person fall asleep; so can changing the temperature or lighting in a bedroom. Sticking with regular bed and wake times can put the brain and body on a schedule that makes sleep more reliable.
The U.S. Food and Drug administration has approved insomnia drugs, such as Ambien, for adults with autism but not for children. For more serious problems such as sleep apnea, clinicians sometimes recommend a nighttime breathing device such as a continuous positive airway pressure (CPAP) machine or, in rare cases, surgery.
But for many sleep issues, melatonin supplements may be a good option. Some research suggests the supplements help children with autism fall asleep faster and get better-quality sleep.
Would better sleep improve quality of life for people on the spectrum?
Maybe. No large, definitive study exists on this topic. But research has shown that typical children and those with autismwho undergo surgery to alleviate breathing trouble during sleep show better social communication and attention as well as fewer repetitive behaviors. Parents reported similar improvements in a small study of children with autism who took melatonin supplements.
REF:
IMUTISM TEAM