$0
A real bedtime and wake time
Same time every day, weekends included. This alone resets your body clock, and it costs nothing.
Health Guide
You're Not Sleeping Enough: The Real Sleep Guide
Adults need7–9 hrs
Teens need8–10 hrs
Sleep cycle length~90 min
Deep sleep target13–23%
REM target20–25%
Caffeine half-life5–6 hrs
Between clopening the coffee shop and picking up catering shifts on weekends, sleep was the first thing I cut. Turns out that math was worse than any of the money math I actually pay attention to. Here's what the research says actually moves the needle, not the stuff that sounds good on a wellness account.
01 · By the numbers
How much sleep you actually need, by age
Not everyone's chasing the same eight hours. These are the ranges pediatricians and sleep researchers actually recommend, newborn to older adult.
Newborn (0–3 mo)14–17 hrs
Why so much: brains and bodies are building basically everything at this stage, and it happens in short unpredictable bursts, not one block.
Infant (4–11 mo)12–16 hrs
What changes: naps start consolidating and a real nighttime stretch begins to form.
Toddler (1–2 yrs)11–14 hrs
What changes: usually down to one solid nap plus overnight sleep.
Preschool (3–5 yrs)10–13 hrs
What changes: naps start dropping off entirely for a lot of kids around this age.
School age (6–12 yrs)9–12 hrs
What changes: one continuous overnight block, no naps, but still more than most adults think.
Teen (13–18 yrs)8–10 hrs
The catch: teenage circadian rhythms actually shift later, so early school starts fight biology directly.
Adult (18–64 yrs)7–9 hrs
The range matters: 7 is a floor, not a target. Consistently landing at 6 is where the real damage starts.
Older adult (65+)7–8 hrs
What changes: total need drops slightly but sleep gets lighter and more fragmented, not less important.
02 · The cycle
What actually happens in a 90-minute sleep cycle
You cycle through these stages roughly four to six times a night. Waking up mid-deep-sleep is why some 7-hour nights feel worse than an 8-hour one that landed better.
Stage 11–5 minThe drift-off. Easy to wake up from, doesn't count as real rest yet.
Stage 2~25 minHeart rate and body temp drop. You spend the most total time here across the night.
Deep sleep~25 minPhysical repair happens here. Hardest stage to wake someone out of.
REM~25 minDreaming and memory consolidation. Stretches get longer each cycle, later in the night.
Brief wakesecondsNormal and universal. You just don't remember it happening.
03 · Budget fixes
The cheap stuff that actually works
You don't need a $400 mattress or a sleep tracker ring to fix most of this. These three do more than all of it combined.
$15
Blackout curtains or a sleep mask
Darkness triggers melatonin. Cheapest, highest-impact upgrade you can make to a room.
$0
Phone out of the bed
Charge it across the room. Blue light delays melatonin release, and the free fix is just not touching it.
04 · Wind-down
The 30 minutes before bed that matter most
Not a whole routine, just three things in order.
1
Cut caffeine by 2pm
Half-life is 5–6 hours, so that 4pm latte is still a quarter active at midnight.
Half-life is 5–6 hours, so that 4pm latte is still a quarter active at midnight.
2
Dim the lights an hour out
Signals melatonin release. Phone brightness down, or off entirely.
Signals melatonin release. Phone brightness down, or off entirely.
3
Get up at the same time regardless
Even after a bad night. This is what resets the cycle, sleeping in just delays it further.
Even after a bad night. This is what resets the cycle, sleeping in just delays it further.
05 · Common mistakes
What's quietly wrecking your sleep
None of these feel like a big deal in the moment. All of them add up.
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Hitting snooze repeatedly
Fragments the light sleep you're already in, so you wake up groggier than if you'd just gotten up.
Fragments the light sleep you're already in, so you wake up groggier than if you'd just gotten up.
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"Catching up" on weekends
Throws off your circadian rhythm. Monday morning ends up feeling like jet lag.
Throws off your circadian rhythm. Monday morning ends up feeling like jet lag.
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"Five minutes" of scrolling in bed
Blue light plus a stimulating feed. Five minutes turns into forty-five, every time.
Blue light plus a stimulating feed. Five minutes turns into forty-five, every time.
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Napping after 3pm
Eats into the sleep pressure you need to fall asleep at a normal hour that night.
Eats into the sleep pressure you need to fall asleep at a normal hour that night.
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Using alcohol as a sleep aid
Knocks you out faster but cuts into REM, so you wake up more, not less, later in the night.
Knocks you out faster but cuts into REM, so you wake up more, not less, later in the night.