Cover lesson · IT · Year 7 · Beginner
DCF: Citizenship → Health and well-being
Name: Class: Date:
What this practises: looking honestly at how screen use affects sleep and well-being, and planning healthier digital habits. Pupils measure every time interval in an invented log, including sleep across midnight, so the time calculations are real numeracy and are marked from the sheet.
Print: this sheet, one per pupil, and the stimulus sheet “Lowri’s screen time and sleep log”, one between two. No computers are needed. Calculators are optional. Pupils should not share their own screen time figures with the class.
Run: 5 min read the stimulus sheet aloud, including the counting-on examples · 12 min Step 1 · 10 min Step 2 · 10 min Step 3 · 8 min Step 4 · 10 min Step 5. Total 55 minutes.
Collect: this sheet. Quick checks: week total 1,540 minutes = 25 hours 40 minutes; mean 3 hours 40 minutes a day; Thursday night sleep 8 hours 5 minutes; school nights under 9 hours: Tuesday, Thursday, Sunday.
Lowri is tired in morning lessons. She kept a log of her screen time and sleep for one week. You will turn her log into hours and minutes, compare her sleep with what sleep experts advise, spot the pattern, and help her plan a better evening without banning her phone.
Use counting on (section 4 of the stimulus sheet). Write each session in minutes, then the day’s total in minutes and in hours and minutes. Monday is started for you.
| Day | Session 1 (min) | Session 2 (min) | Total (min) | Total (hours and minutes) |
|---|---|---|---|---|
| Monday | 45 | 110 | ||
| Tuesday | ||||
| Wednesday | ||||
| Thursday | ||||
| Friday | ||||
| Saturday | ||||
| Sunday |
(a) Add up the seven daily totals. Give the answer in minutes, then in hours and minutes.
(b) Find the mean screen time per day (total ÷ 7). Give it in hours and minutes.
(c) Her phone said she was “up 2 hours 20 minutes on last week”. How much screen time did she have last week?
Count on from light out to woke up, through midnight. Then find the gap between her last screen session ending and her light going out.
| Night | Sleep (hours and minutes) | School night? | Screen off to light out (min) |
|---|---|---|---|
| Monday | Yes | ||
| Tuesday | Yes | ||
| Wednesday | Yes | ||
| Thursday | Yes | ||
| Friday | No | ||
| Saturday | No | ||
| Sunday | Yes |
(a) Lowri is 11. Section 3 of the stimulus sheet says children aged 6 to 12 should sleep 9 to 12 hours. On which school nights did she sleep less than 9 hours? How many minutes short was she each time?
(b) Look at the time her screens went off on school nights. What do you notice about the nights she slept least? On which school night did she follow the “about an hour” advice?
(a) On school days Lowri wakes at 07:00. She wants at least 9 hours 30 minutes of sleep. What is the latest time her light should go out? If she follows the “about an hour” advice, when should her screens go off?
(b) Rewrite her Thursday evening so that she still gets the same total screen time (Step 1), but her screens go off at the time you found in (a). Give start and finish times.
(c) Write three changes to her phone settings or habits that would help her stick to the plan. For each one, say why it helps.