Sleep Delta Blog
Evidence-based articles across the six domains of sleep health — what the research actually says, and what to do about it.
Waking at 3am is usually a collision between light second-half sleep and a specific trigger. Here are the real causes and what actually helps.
July 3, 2026 · 5 min read
Large studies now suggest a consistent sleep schedule predicts long-term health as strongly as sleep duration, and by some measures more strongly. Here is the evidence.
July 3, 2026 · 6 min read
Most healthy adults fall asleep in 10 to 20 minutes. Consistently under 5 minutes or over 30 both signal problems. Here is what your sleep latency means.