PROS AND CONS OF LATER START TIMES
Later school start times have been associated with better sustained attention, school attendance and improved academic performance, said Dr Lim of NUH.
“This is not surprising when one appreciates the function of the brain as a memory aid. It is important to get enough sleep the night before and the night after learning. Sleep restores the brain’s capacity for learning and makes rooms for new memories,” he added.
“There is enough evidence showing that schoolchildren who sleep longer obtained better grades across the board, and the impact of later school start times would impact greatest on adolescents, as this allows for longer sleep duration on school days with a timetable that is in sync with their physiologically delayed circadian rhythm.”
When students are well-rested and refreshed, they can pay attention, learn better and have better mental and physical health, said Assoc Prof Teoh.
“Longer sleep time can help reduce daytime sleepiness, improve socio-emotional functioning and academic performance, and reduce risks of accidents,” he added.
But later start times also lead to logistical issues.
Member of Parliament Leon Perera (WP-Aljunied) said in Parliament on Tuesday that in previous discussions on school start times, the possibility of traffic congestion was a concern if school buses were taking students to school at the same time as office workers heading to work.
“Will the Government also consider that with the trend towards working from home, flexible work and so on, which may persist beyond the COVID pandemic, that is an issue that actually may be much less of a concern,” he added.
If all schools implemented later start times, this could affect parents’ work schedule and contribute to morning traffic and public transport congestion, echoed Assoc Prof Teoh.
“Adjustments will also be needed to stagger work hours of some parents, for food catering arrangements and other enrichment activities to cater for different start and end times at school,” he added.
There may also be concerns about pushing extracurricular activities to later in the day, completing homework assignments later in the day, therefore resulting in later bedtimes, said Dr Lim, noting data has shown that later start times lead to longer sleep duration despite this concern.
DEVELOPING GOOD SLEEP HABITS
However, later start times do not mean parents and children do not need to cultivate and maintain good sleep hygiene habits, experts told CNA.
If bedtime is moved later because of the later start time, this will reduce the impact of the change, said Assoc Prof Teoh.
“The reality is that some students sleep late because of academic demands, and some due to parental work schedules which impact the family’s daily routine,” he added.
Children should have regular sleeping hours, said Dr Kenny Pang, a ear, nose and throat specialist at Asia Sleep Centre.
Primary school children should be in bed by 9pm to 9.30pm, and secondary school children should be in bed by 10pm to 10.30pm. Most of them wake up at around 6am to 6.15am to prepare for school, have breakfast and travel to school as most schools start at 7.30am, he noted.
“Hence, it would be intuitive to start school at 8am, so that the kids may wake up slightly later too, this would mean more sleep for them.”
The use of digital devices can also disrupt sleep, experts stressed. At night, the pineal gland in the brain releases vast quantities of melatonin, a hormone that signals to our bodies that it is time for bed, said Dr Lim.
Artificial light, including blue light from phones and laptops, can fool the brain into thinking that the sun has not yet set. In turn, melatonin is suppressed, and this makes it less likely to fall asleep at a reasonable time, he added.
“Apart from delaying the timing of melatonin release and taking longer to sleep, there is poorer quality of sleep when one does get to sleep.”
To avoid this situation, parents should establish “strict ground rules” around bedtime, and keep the timing consistent every day, including on weekends, said Dr Lim.
Parents can also establish a regular, calming and relaxing bedtime routine 30 to 60 minutes before bed.
“Keep all electronic devices outside the bedroom during this time. For children especially, do not allow excessive use of electronic devices in the daytime as well,” he added.
“The short-term effects of sleep deprivation can be reversed once the child starts getting adequate good quality sleep as a matter of routine. It can take weeks to clear an accumulated sleep debt and for these symptoms to reverse,” said Dr Lim.
“The long-term health consequences ... will often be from chronic sleep deprivation, once they are established, the window for improving these health effects is gone.”
Continue reading...