The internal body clock is still alert, now trained by years and years of early mornings. (code-brew.com)
Two groups of researchers have independently discovered the long sought dual body clocks in the brain of fruit flies that separately govern bursts of morning and evening activity. (hhmi.org)
Light can throw off your kid's natural body clock and make it harder to fall asleep, so keep his room as dark as possible. (sleep.org)