Awareness periods - Topics

The post-lunch dip shows up even when you skip lunch The 3 to 5 am circadian trough is where night shift accident data clusters Siesta cultures may follow heat and meals rather than biology A 20-minute nap avoids the grogginess of a full 90-minute cycle A phone's vibration pattern changes how urgent a message feels Microsleeps last a few seconds and arrive before you notice any sleepiness Why does infrasound below 20 hertz make people uneasy? Why can nobody remember the exact moment they fell asleep? Sleep inertia makes you worse at everything than you were while asleep Why does depression flatten the present until days blur together? Why do small animals seem to see the world in slow motion? The wake maintenance zone gives you an alertness spike right before bedtime Shift workers rarely adapt fully to night work even after years on the schedule Mackworth's clock test in wartime showed how fast vigilance collapses Van Dongen showed chronic six-hour sleepers perform like people who stayed up two nights Why 90 minutes became the default block length How far back does the brain reach to build a single now? Time of day changes whether you are better at insight or at analysis Chronopharmacology finds the same drug behaving differently at 8 am and 8 pm Kleitman's 90-minute basic rest-activity cycle is still argued about Why does a fire alarm use a tone built to wake you at 3 a.m.?