Ask a room full of eighth graders how they slept last night and you’ll get groans. Most of them are tired, and most of the adults around them assume it’s because of phones. That’s part of the story, but not all of it. This free printable worksheet uses a short informational article to explain the science behind teenage sleep, and it gives students plenty of practice with one of the most important nonfiction skills at this level: finding the central idea and summarizing it fairly.
The topic is personal, which helps. Students aren’t reading about something distant. They’re reading about their own brains, and that makes them pay closer attention.
Download the Worksheet and Answer Key
The Grade 8 informational text worksheet and its separate answer key are free to download and print. They need no prep and work in ELA, science, health, or a homeschool reading block. Print a copy, read it together, and you might find your students finally understand why they’re so tired at 7 a.m.
For More grade 8 worksheets, Visit Grade 8 Reading Comprehension Worksheets.
What the Article Explains
“The Teenage Body Clock” opens with a scene most students will recognize: 11 p.m. on a school night, alarm set for 6:15, and a teenager lying wide awake. From there, the article moves through the science one step at a time.
First, it explains the circadian rhythm, the internal clock that runs on a cycle of about 24 hours. It describes how the brain releases melatonin in the evening to signal sleep and slows it down in the morning when light appears.
Next, it explains what changes during puberty. In teenagers, melatonin is released later in the evening, often an hour or two later than in younger children. Scientists call this a sleep phase delay. It means many teens truly aren’t sleepy until 11 p.m. or later, no matter how early they go to bed.
The article then connects the science to school schedules. Experts recommend 8 to 10 hours of sleep for teens, but early start times leave many with barely seven. It covers the American Academy of Pediatrics recommendation that middle and high schools start no earlier than 8:30 a.m. and California’s law requiring later start times. Then it presents the other side: later start times can complicate buses, sports, and family schedules.
It closes with practical steps teens can take, such as keeping a steady sleep schedule, getting morning light, and putting screens away before bed.
Why Informational Text Matters in Grade 8
By eighth grade, students read more nonfiction than fiction across their school day. Science textbooks, history readings, news articles, and online sources all demand the same skills: figure out what the author is really saying, see how each section supports that point, and restate it accurately.
That last part is harder than it sounds. When students summarize, they often add opinions (“This article shows schools are unfair”) or drift into retelling every detail. Learning to write an objective summary is a big step, and it shows up on almost every standardized reading test at this level.
This article is built to make that skill easier to practice. Each section has a clear heading, and each one adds a new layer to the central idea. Students can literally watch the idea develop from paragraph to paragraph. The article also presents two sides of the school start time debate without taking a side itself, which gives students a model of balanced informational writing.
What’s Inside the Worksheet
The worksheet follows the same four-part format used across the site.
Part A: Multiple Choice. Four questions check key facts: what a circadian rhythm is, how melatonin changes during the teen years, how much sleep experts recommend, and which challenge of later start times the article mentions.
Part B: True or False. Three statements test careful reading. One claims that going to bed earlier always solves the problem, which catches students who skimmed past the explanation of sleep phase delay.
Part C: Central Idea and Objective Summary. This is the core skill section. A short note explains both terms in plain language. Students state the central idea and list two details that develop it, then write a two-sentence summary without any personal opinion.
Part D: Think and Explain. The final question asks students to take a position: should their school start later? They need at least two pieces of evidence from the article. Because the article presents both sides, strong answers can go either way, as long as they’re supported.
The separate answer key includes every correct answer, plus sample responses for the open-ended items and notes on what to accept.
How to Use This Worksheet
In ELA, use it to teach the difference between a summary and a response. Have students complete Part C first, then Part D, and talk about how the two answers sound different.
In science or health class, the article works as a reading-based introduction to the body’s internal systems. It pairs well with a short unit on hormones or sleep.
As a debate starter, split the class into two groups after reading. One side argues for later start times, the other against, using only evidence from the article. It’s a quick way to show how the same text can support different conclusions.
At home, expect about 30 to 35 minutes. Parents might find the article useful too, since it explains why their teenager isn’t simply being stubborn at bedtime.
If you plan to pair this with a news article on sleep, run the article through a Flesch-Kincaid readability checker first to see whether it needs simplifying for your students.
Tips for Teaching Central Idea and Summary
Use the headings as a map. Ask students to write one sentence for each section, then look at all five sentences together. The central idea usually becomes obvious once they see the pieces side by side.
Teach the “opinion check.” After students write a summary, have them underline any word that shows a feeling or judgment, like “unfair,” “should,” or “terrible.” If they find one, it doesn’t belong in an objective summary.
Separate the central idea from the topic. The topic is sleep. The central idea is what the author says about it. Many students write “This article is about sleep” and stop there, so push them to finish the thought.
Point out the balanced structure. The article gives reasons for later start times and then admits the challenges. Ask students why an informational writer would include both. This builds awareness of the difference between informing and persuading.
Let students connect it to their lives, but only after the summary is done. Once the objective work is finished, invite them to share their own sleep habits. Keeping the two steps separate reinforces the whole lesson.
More Grade 8 Reading Practice
This worksheet fits nicely alongside the other Grade 8 resources. Students who want to see how a writer argues one side of a school issue can compare this article with the Grade 8 persuasive essay on homework policy. For fiction, read The Understudy, a story about a student whose big moment arrives without warning. The poem Static captures the noise and pressure of a school day, a nice match for an article about tired students. You can also explore the Grade 8 drama The Right Thing or the ancient myth The Weaver of Stars, which, like this article, explains why the world works the way it does.
Students who are ready for a more advanced take on school schedules can move up to the Grade 9 essay The Case for the Four-Day School Week. For an easier informational passage, try Turning the Tide, a Grade 7 article about ocean plastic.