Many students are back at schools across Ireland this week after their summer holidays, while others are starting for the first time.
Parents will be looking to set them up for the day ahead by making sure they have a good night's sleep.
However many don't know what is the right time to get their little ones tucked up on bed.
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One teacher has shared an interesting guide to bedtime and getting up in the morning, which is organised by children's ages.
The post was shared by an educator from Wilson Elementary School, but isn't new and has done the rounds before, Mirror UK reports.
It recently resurfaced on social media and caused a stir with many parents, who were left feeling divided over the timings.
The guide claims that a seven-year-old, who needs to be up at 7am in the morning should go to bed at 8:15pm, while a 10-year-old getting up at 6:30am should be in bed by 8:30pm.
The chart was first shared by Stacy Karlsen, who told Fox6Now she couldn't believe the post went viral.
She said: "To me, it was a shock [that the post was shared so much]. I didn't make it up. I found it coming across my personal page and I thought, 'Wow, this is super helpful'."
Some parents agreed with Stacy that the chart was a useful guide. One mum claimed it "justified" the bedtimes she had already put in place for her little ones.
"I have four kids — and I catch a lot of flack for their bedtimes," she explained. "I started out setting their bedtime years ago based on how much sleep they need... Glad to see this chart justify the exact times we have already set."
However, not everyone was quite so impressed with it. A different parent compared the rigid guidelines to being in the military.
He argued: "This isn't the military and if I was to send my kids to bed at 7 at night they would be up at 4 a.m. No thank you. Plus I would never get to spend time with them after school."
Another commented: "I'm sorry, but this chart is absurd. Who puts their kid to bed at 6:45?"
Others thought that the bedtime rules should differ during certain months and depending on whether the child has had naps during the day.
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