Back to Sleep at 3AM

About Back to Sleep at 3AM

Back to Sleep at 3AM is a free sleep-education site for people who wake up in the middle of the night and can't fall back asleep. It explains, in plain language, what's happening in your body at 3AM and what actually helps — tonight and over time.

Where the information comes from

Every key claim on this site is drawn from public, authoritative sources — not invented, and not copied from them. The main ones:

• Sleep cycles and REM. Sleep runs in cycles of about 90–120 minutes, with NREM sleep dominating the first half of the night and REM sleep predominating in the second half. — StatPearls, EEG Normal Sleep (NCBI Bookshelf).
• Cortisol's daily rhythm. Cortisol peaks in the early morning and declines to its lowest point in the early nighttime, with a surge in the first 30–45 minutes after awakening. — Andreadi et al., Modified Cortisol Circadian Rhythm, International Journal of Molecular Sciences (2025), via PMC.
• The 20-minute rule and fixed wake time. If unable to fall asleep within about 20 minutes, get out of bed and return only when sleepy; keep a fixed rise time. — American Academy of Sleep Medicine, Brief Behavioral Treatment for Insomnia (BBTI) provider fact sheet; see also the AASM clinical practice guideline for insomnia.
• Morning light. Bright light in the morning shifts the circadian clock earlier; two hours of morning bright light phase-advanced circadian rhythms in a controlled trial. — CDC/NIOSH, Using Light to Promote a Better Morning Wake-Up Time; Rosenthal et al., Phase-shifting effects of bright morning light, Sleep (1990).
• Caffeine timing. Minimize or avoid caffeine, none after noon. — AASM clinical practice guideline for insomnia (sleep hygiene).

What this site is not

Everything here is general sleep education. It is not a diagnosis, it does not recommend medication or supplements, and it does not promise a cure. No content on this site is presented as reviewed by a doctor, and no author credentials are claimed. If your pattern is new, sudden, or comes with other symptoms, talk to a clinician.