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Washington D.C., May 8: The prime time for brain development in a child's life is the first year, where the infant spends most of the time asleep. It is the time when neural connections form and sensory memories are encoded.

However, when sleep is disrupted, as occurs more often among children with autism, brain development may be affected, too.

New research led by the University of Washington finds that sleep problems in a baby's first 12 months may not only precede an autism diagnosis but also may be associated with altered growth trajectory in a key part of the brain, the hippocampus.

The study, which was published in the American Journal of Psychiatry, researchers report that in a sample of more than 400 taken of 6- to 12-month-old infants, those who were later diagnosed with autism were more likely to have had difficulty falling asleep.

It also states that this sleep difficulty was associated with altered growth trajectories in the hippocampus.

"The hippocampus is critical for learning and memory, and changes in the size of the hippocampus have been associated with poor sleep in adults and older children.

As many as 80 per cent of the children with autism spectrum disorder have sleep problems," said Annette Estes, director of the UW Autism Center and senior author of the study.

"In our clinical experience, parents have a lot of concerns about their children's sleep, and in our work on early autism intervention, we observed that sleep problems were holding children and families back," added Estes, who is also a UW professor of speech and hearing sciences.

"It could be that altered sleep is part-and-parcel of autism for some children. One clue is that behavioural interventions to improve sleep don't work for all children with autism, even when their parents are doing everything just right. This suggests that there may be a biological component to sleep problems for some children with autism," said Estes.

To consider links among sleep, brain development, and autism, researchers at the IBIS Network looked at MRI scans of 432 infants, surveyed parents about sleep patterns, and measured cognitive functioning using a standardized assessment.

At the outset of the study, infants were classified according to their risk for developing autism: Those who were at higher risk of developing autism -- about two-thirds of the study sample -- had an older sibling who had already been diagnosed.

Infant siblings of children with autism have a 20 per cent chance of developing autism spectrum disorder -- a much higher risk than children in the general population.

In the current study, 127 of the 432 infants were identified as "low risk" at the time the MRI scans were taken because they had no family history of autism.

They later evaluated all the participants at 24 months of age to determine whether they had developed autism. Of the roughly 300 children originally considered "high familial risk," 71 were diagnosed with autism spectrum disorder at that age.

Problems with sleep were more common among the infants later diagnosed with an autism spectrum disorder, as were larger hippocampi. No other subcortical brain structures were affected, including the amygdala, which is responsible for certain emotions and aspects of memory, or the thalamus, a signal transmitter from the spinal cord to the cerebral cortex.

The authors note that while parents reported more sleep difficulties among infants who developed autism compared to those who did not, the differences were very subtle and only observed when looking at group averages across hundreds of infants.

Sleep patterns in the first years of life change rapidly as infants transition from sleeping around the clock to a more adult-like sleep/wake cycle. Until further research is completed, Estes said, it is not possible to interpret challenges with sleep as an early sign of increased risk for autism.

Bengaluru, May 20: Ride-sharing company Ola Cabs said on Wednesday it will lay off 1,400 of its employees due to business uncertainty caused by the coronavirus pandemic while the revenue has come down by 95 per cent in the past two months.

"The COVID crisis continues to unfold all around us causing unprecedented economic and social destruction. It has also become evident that the coronavirus will not be eliminated any time soon," wrote co-founder and CEO Bhavish Aggarwal to all Ola employees.

"In these circumstances, today I write to all of you with the toughest decision I have ever taken -- the need to downsize our organisation and let go of 1,400 of our valued employees," he said.

Aggarwal said the fallout of virus has been very tough for the cab aggregating industry in particular. "The company's revenue has come down by 95 per cent over the past two months," he said.

Initially, he said, the company hoped it would be a short-lived crisis and that its impact would be temporary. "But unfortunately, it is not been a short crisis. And the prognosis ahead for our business is very unclear and uncertain. It is going to take a long time for people to go out and about like before."
With more companies preferring to have a large number of employees work from home, air travel limited to essential trips and vacations being put off for better times, the impact of this crisis is definitely going to be long-drawn, said Aggarwal.

"The world is not going to revert to the pre-COVID era anytime soon. Social distancing, anxiety and an abundance of caution will be the operating principles for everyone," he told employees.

Aggarwal said the crisis necessitates the need to conserve cash aggressively so that Ola is able to invest in opportunities in the future, adding the downsizing exercise has been a very tough and sad decision for the management team to make.

"While we restructure our organisation to the new realities of our business, we are also going to recommit ourselves to strengthening our operational excellence and leverage a lot more technology to improve efficiencies and reduce cost across all parts of our business," he said.