Nocturne, an infant sleep tracker that admits uncertainty

Field notes

The tracker begins with age-based defaults, then shifts toward observed wake windows after roughly five naps and gives more weight to recent days when nap patterns change. Its logging model is deliberately small: asleep, awake, nap or night waking, with offline taps, corrections, and automatic handling for forgotten timers. The page also identifies four research sources and says each recommendation can expose its supporting citation.