Sleep articles, reviewed by credentialed consultants.
Three sections. Pillar guides go deep on head-term topics. Parent zone is reviewed by Marie Hansen, PSC. Adult sleep is reviewed by Logan Foley, CSSC.
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Editor’s pick
9MIN READ
4-Month Sleep Regression: What It Is + 3 Things to Do
4-month sleep regression explained by a PSC: what it actually is, why old strategies stop working, and 3 evidence-rated fixes that resolve it in 2-6 weeks.
Long-form, hub-and-spoke topic guides.
Start here when you want depth, not a quick answer.
Sleep science, lifestyle, and common problems.
Caffeine, jet lag, the 3 a.m. wake — what's really going on and what to try.
- Adult sleep · Lifestyle8 min
Caffeine and your sleep architecture.
Caffeine has a 5-hour half-life. A 2pm coffee is still measurably reducing your deep sleep at midnight — even if you fall asleep fine. The half-life math, the adenosine story, and the cutoff that actually works for your metabolism.
CSSCLogan Foley, CSSCReview pendingEditor’s pick - Adult sleep · Common problems8 min
Tired but can't fall asleep — five most likely causes.
When your body says it's exhausted but your mind won't switch off. The five usual suspects, ranked by how often they're actually the problem, with the diagnostic symptom and first fix for each.
CSSCLogan Foley, CSSCReview pending - Free printable
Wake windows by age, in your inbox.
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Get the PDF → - Adult sleep · Common problems8 min
The 3am wake-up — five most likely causes.
Falling asleep is fine. Waking at 3am and not getting back to sleep — that's a different problem with different causes. Here are the five usual suspects, ranked by frequency, with the diagnostic symptom and first fix for each.
CSSCLogan Foley, CSSCReview pending - Adult sleep · Lifestyle8 min
Jet lag — what it actually is, and what works.
Jet lag isn't tiredness from travel. It's a phase mismatch between your circadian clock and your destination, and only specific interventions actually shift it. Here's what the chronobiology research says works, ranked by strength.
CSSCLogan Foley, CSSCReview pending
Newborn through preschool, reviewed by a pediatric sleep consultant.
Wake windows, regressions, nap transitions — the playbook by stage.
- Parent zone · 0–3 months9 min
Newborn sleep: what to expect (0–3 months)
How newborn sleep actually works in the first 12 weeks — wake windows, feeding cadence, day/night confusion, and what's normal vs concerning. Pediatric-reviewer guidance.
PSCMarie Hansen, PSCReview pending - Parent zone · 4–12 months9 min
Infant sleep: 4–12 months
What infant sleep looks like from 4 months to one year — sleep regressions, nap transitions, sleep training options, and when independent sleep skills emerge. Pediatric-reviewer guidance.
PSCMarie Hansen, PSCReview pending - Parent zone · 1–3 years9 min
Toddler sleep: 1–3 years
Toddler sleep through ages 1, 2, and 3 — the 2-to-1 nap transition, bedtime resistance, night terrors vs nightmares, and the crib-to-bed move. Pediatric-reviewer guidance.
PSCMarie Hansen, PSCReview pending - Parent zone · 3–5 years9 min
Preschool sleep: 3–5 years
Preschool sleep through the nap-to-no-nap transition, imagination-driven fears, the kindergarten schedule reset, and screen-time impact. Pediatric-reviewer guidance.
PSCMarie Hansen, PSCReview pending - Parent zone · 3–5 months9 min
4-Month Sleep Regression: What It Is + 3 Things to Do
4-month sleep regression explained by a PSC: what it actually is, why old strategies stop working, and 3 evidence-rated fixes that resolve it in 2-6 weeks.
PSCMarie Hansen, PSCReview pendingEditor’s pick