Everything is harder on six hours of sleep

If you're between thirteen and seventeen, you need somewhere around eight to ten hours of sleep. Most teenagers get six or seven, and almost all of the missing hours went to a phone.

This isn't a lecture about screen time. It's about what you're actually losing.

What the missing two hours costs

• Memory. Sleep is when what you learned that day gets filed. Revising until 1am is worse than revising until 11 and sleeping, and it isn't close.
• Training. You grow and repair during deep sleep. Short sleep means the training you're doing produces less than it should.
• Mood. Short sleep makes everything feel worse and makes you snap at people you aren't actually angry with.
• Skin. Yes, genuinely.
• Reaction time. Relevant for sport, and extremely relevant the year you start driving.

Your body clock actually did shift

One thing worth knowing: your sleep timing genuinely moves later during your teens. It's biological, not laziness, and it's why you're wide awake at midnight and destroyed at 7am.

That's real. It also doesn't help you at all, because school still starts at nine. So the aim is to stop making it worse.

What actually works

Charge the phone in another room. Not on the desk, not face down on the bed. Another room. This one change does more than everything else on this list combined, and it's the one everybody argues about.

Get a $5 alarm clock. The "I need it for my alarm" thing is the reason, and it's worth removing.

Set a screens-off time and make it the same every night. An hour before you want to be asleep.

Same wake-up time at weekends, or within about an hour. Sleeping until two on Saturday feels amazing and wrecks Sunday night, which wrecks Monday.

No caffeine after about 4pm. Energy drinks in the evening are a big part of why people can't get to sleep and then use another one at 8am to fix it. That loop is very easy to get into at fifteen and genuinely hard to get out of.

Keep the room dark and cool.

Try it for two weeks

Not forever. Two weeks of the phone charging somewhere else and a consistent wake-up time.

Most people who actually do it notice inside five days, and the thing they notice isn't that they feel sleepy less — it's that they feel less irritated by everything, all day.