We read the studies so you don't have to. Each breakdown tells you what the research found, what it did not prove, and what it actually means for your sleep.
What it found: Multiple studies link ambient temperatures around 65°F (18°C) to more deep sleep and fewer awakenings.
What it didn't prove: Individual comfort varies, and most studies are small and short-term.
What it found: Bright evening light can suppress melatonin and push sleep timing later by meaningful amounts.
What it didn't prove: Effect sizes depend on light intensity, timing, and individual sensitivity.
What it found: Some recovery is possible over several nights, and short deficits can be partly repaid.
What it didn't prove: Weekend recovery doesn't fully reverse the effects of chronic, ongoing sleep loss.
What it found: Small trials, especially in older adults, suggest modest improvements in sleep onset and quality.
What it didn't prove: Evidence is mixed and larger, higher-quality studies are still needed.
What it found: Cognitive behavioral therapy for insomnia is a first-line treatment with durable benefits.
What it didn't prove: Access to trained providers is limited, and it requires consistent effort.
What it found: Regular exercise improves sleep; for most people even evening exercise doesn't hurt it.
What it didn't prove: Very intense workouts right before bed may disrupt sleep in some individuals.
Restore follows a transparent methodology: peer-reviewed sources, honest reporting of limitations, and expert review. Learn how we test and review.