Tired body, wired brain: your sleep drive is loaded, but the arousal system - stress, racing thoughts, caffeine, late screens - is overriding it.
Sleep needs both systems to line up, and exhaustion only powers one. NHLBI notes short-term insomnia ties to stress or schedule changes and passes in days to weeks; 3-plus nights a week for over 3 months is chronic insomnia, best treated with CBT for insomnia. The counterintuitive rule: not asleep in about 20 minutes, get up and do something dim and boring until sleepy - the bed stays paired with sleep.
What to do
Common questions
Why can't I fall asleep even when I'm tired?
Because sleep requires two systems to line up, and exhaustion only powers one. The sleep drive builds all day - that is the tired part - but the arousal system can override it: stress hormones, racing thoughts, and a brain trained to treat the bed as a worry station keep the alert side switched on. That is the "tired but wired" state, and it is the most common sleep complaint there is. The usual suspects, in order of likelihood: stress and rumination lying down for the first quiet moment of the day; caffeine within 8 or so hours of bed; alcohol, which sedates then fragments; late bright screens feeding the brain daylight and stimulation; an irregular schedule that never lets the body clock set; and napping long or late enough to drain the sleep drive. NHLBI notes short-term insomnia often ties to stress or schedule changes and passes in days to weeks - the persistent version, 3-plus nights a week for over 3 months, is chronic insomnia and responds best to CBT for insomnia, which outperforms pills long-term. The counterintuitive rule: if you are not asleep in about 20 minutes, get up and do something dim and boring until sleepy - the bed stays paired with sleep. Pymander, a free AI doctor available 24/7 by text, can help you troubleshoot the pattern.