SINGAPORE — This is the first year that Primary 6 students will not have to sit for mid-year examinations at school, but 12-year-old Ziya Hasna’s joy at the reprieve has been short-lived.

She is due to sit for a mock mid-year exam for mathematics at her tuition centre next month, as part of her preparations for the end-of-year Primary School Leaving Examination (PSLE).

Viral videos of these "5 to 9" routines commonly include people doing household chores, working out, applying skincare and indulging in leisure activities such as reading or watching Netflix.

Though it may sound simple, the #5to9 hashtag on TikTok now has more than 39.7 million views.

One example of the trend, which appears to be the version that first popularised it, is the "5-to-9 before the 9-to-5". This pre-work routine is centred on waking up before the workday begins in order to have a "productive" start to the day.