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The nicotine you use to settle yourself before bed is a stimulant. It does not calm you. It winds your brain up. You feel it relax you because it takes away a craving. The chemical itself is doing the opposite in your brain.
You have fixed the light, the caffeine, the room. This is the stimulant hiding as a comfort. Nicotine clears fast, but not fast enough for the last hour. Its half-life runs around two hours.
So the dose you take at 10pm is still active at midnight. It keeps you in the light stages and out of deep sleep.
You fall asleep, then surface at 2am and cannot place why. The stimulant is still working while you try to sleep through it.
You slept. Nothing went deep.
In a polysomnography study published in the American Journal of Epidemiology, smokers spent more of the night in light sleep and less in deep sleep than non-smokers. Their brain recordings showed the shift, not just their reports.
That study compared smokers with non-smokers, not one nicotine dose against none. So read it as strong evidence nicotine lightens sleep, and the last-hour timing as the sharpest version of it.
TONIGHT
In the last hour, take in no nicotine at all. No vape, no pouch, no gum, no last cigarette. If you use a nicotine patch, check whether yours is meant to come off before bed. Many are, because worn overnight they can cause insomnia and vivid dreams.
If it is part of a quit program, follow the plan and ask a pharmacist. Better still, leave a two-hour gap, since that is roughly one half-life. The last hour is the floor, not the ideal.
The nicotine in your last hour is the deep sleep you trade for a few calm minutes. Cut it from the window, and the night stops running light.
