A banker in his forties had been waking at 3:40 a.m. most nights for three years — so consistently he'd stopped needing an alarm to know the time. He talked about his bedtime like it was the whole story: what time he turned off the light, which supplement he'd tried last. He never once mentioned 6pm. That's usually where the problem starts.
We talk about insomnia as if it begins at bedtime. More often, it begins with the life that leads up to it.
The window nobody watches
Melatonin release doesn't switch on the moment you close your eyes. It ramps up over roughly four hours, starting in the early evening for most adults on a typical schedule. Whatever you do during that ramp either supports it or fights it. Bright overhead light, a heavy meal, a hard workout, an intense conversation — any of these can push the ramp later without you ever noticing the delay until you're staring at the ceiling at midnight wondering why tonight feels different.
Body temperature plays a quieter role in the same window. Core temperature needs to drop for sleep onset to happen smoothly. A late dinner, alcohol, or a hot shower too close to bed can keep it elevated longer than expected, which shows up as trouble falling asleep even though you technically did everything else right.
Why the fix isn't a bedtime routine
Most sleep advice focuses on the last thirty minutes: dim the lights, put the phone away, read a book. That advice isn't wrong, but it's aimed at the wrong window. By 10pm, the ramp is already most of the way finished. If dinner was late, the lights were bright, and the last email of the day arrived at 8:45, no amount of lavender spray at 10:15 is going to undo it.
The four hours before bed are doing more work than the ten minutes you spend trying to fall asleep.
What to actually watch
Start with dinner timing rather than bedtime. A meal finished at least three hours before you plan to sleep gives your core temperature room to fall on schedule. Then look at light: dimming overhead lights in the early evening, rather than only at bedtime, gives your circadian signal a clearer cue that night is approaching. Neither change requires new equipment or a new app. Both are about noticing a window most people skip past entirely.
If you've been treating bedtime as the whole problem, the four hours before it are worth a second look. That's usually where the actual pattern lives.
Inspired by an essay on Healing the Split. Patient details changed to protect privacy.