在有课的日子（如周一至周五），你通常几点睡觉？
在没课的日子（如周末或假期），你通常几点睡觉？
When you have/don’t have class the following day, at what time do you usually go to bed?’ with 13 possible answers for each question: “not after 9 p.m.”, around 9.30 p.m., around 10 p.m., around 10.30 p.m.; around 11 p.m., around 11.30 p.m., around midnight, around 12.30 a.m., around 1 a.m., around 1.30 a.m., around 2 a.m., around 2.30 a.m., “3 a.m. or later”. When the subjects ticked off “not after 9 p.m.”: we entered 9 in our calculation and when they ticked off “3 a.m. or later”: we entered 3.
| 选项 | 选项值 | 赋值 |
| 1 | 晚上9点之前 | 21:00 |
| 2 | 大概晚上9:30 | 21:30 |
| 3 | 大概晚上10:00 | 22:00 |
| 4 | 大概晚上10:30 | 22:30 |
| 5 | 大概晚上11:00 | 23:00 |
| 6 | 大概晚上11:30 | 23:30 |
| 7 | 大概凌晨00:00 | 00:00 |
| 8 | 大概凌晨00:30 | 00:30 |
| 9 | 大概凌晨01:00 | 01:00 |
| 10 | 大概凌晨01:30 | 01:30 |
| 11 | 大概凌晨02:00 | 02:00 |
| 12 | 大概凌晨02:30 | 00:00 |
| 13 | 凌晨03:00或以后 | 03:00 |
在有课的日子（如周一至周五），你通常几点起床？
在没课的日子（如周末或假期），你通常几点起床？
‘When you have/don’t have class the following day, at what time do you usually wake up?’ with 15 possible answers for each question “not after 5 a.m. around 5.30 a.m., around 6 a.m., around 6.30 a.m., around 7 a.m., around 7.30 a.m., around 8 a.m., around 8.30 a.m., around 9 a.m., around 9.30 a.m., around 10 a.m., around 10.30 a.m., around 11 a.m., around 11.30 a.m., noon or after noon”. When the subjects ticked off “not after 5 p.m.”: we entered 5 in our calculation and when they ticked off “noon of after noon”: we entered 12.
| 选项 | 选项值 | 赋值 |
| 1 | 早上5点之前 | 05:00 |
| 2 | 大概早上5:30 | 05:30 |
| 3 | 大概早上6:00 | 06:00 |
| 4 | 大概早上6:30 | 06:30 |
| 5 | 大概早上7:00 | 07:00 |
| 6 | 大概早上7:30 | 07:30 |
| 7 | 大概早上8:00 | 08:00 |
| 8 | 大概早上8:30 | 08:30 |
| 9 | 大概早上9:00 | 09:00 |
| 10 | 大概早上9:30 | 09:30 |
| 11 | 大概早上10:00 | 10:00 |
| 12 | 大概早上10:30 | 10:30 |
| 13 | 大概早上11:00 | 11:00 |
| 14 | 大概早上11:30 | 11:30 |
| 15 | 中午12点或下午 | 12:00 |
Total Sleep Time Severely Drops during Adolescence
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3474762/
Bedtimes ranged in half-hour intervals from “No later than 21:00” to “2:00 or later” for school days and to “4:00 or later” for nonschool days. Wake times ranged in half-hour intervals from “No later than 5:00” to “8:00 or later” for school days and from “No later than 7:00” to “14:00 or later” for nonschool days.
We calculated sleep duration on school and nonschool days using bed and wake times. For each half-hour interval, we used the time at midpoint in our calculations (e.g., 22:15 if the bedtime response was “between 22:00 and 22:30”). For responses at the ends of the scale, we used the inimum/maximum stated time (e.g., 14:00 if the waketime response was “14:00 or later” and 5:00 if the waketime response was “No later than 5:00”).
We calculated social jetlag using the difference in bedtimes on nonschool and school days [25]. We also assessed whether students met the minimum sleep recommendation for their age using current international guidelines [26,27], which recommend at least 9 hours for those aged 5e13 years (optimal range 9-11 hours) and 8 hours for those aged 14-17 years (optimal range 8-10 hours).
How Are Adolescents Sleeping? Adolescent Sleep Patterns and Sociodemographic Differences in 24 European and North American Countries
https://doi.org/10.1016/j.jadohealth.2020.03.013