Why You Feel Tired but Wired at Night
Sandra White, Certified CBT-I Clinician, Harvard Medical School Doctor-Trained
Last updated October 22, 2026
You were falling asleep on the sofa at nine. You dragged yourself upstairs, got into bed, turned out the light, and suddenly you're wide awake. You're exhausted, so why can't you sleep now?
Women describe this to me almost word for word. I'm Sandra White, a certified CBT-I clinician trained by a Harvard Medical School doctor, and I know this one personally. I spent years sleeping four to five hours a night. Being tired all day didn't mean I could sleep when I finally had the chance.
What tired but wired actually is
Two separate systems decide whether you sleep. One is your drive to sleep, which builds the longer you're awake. The other is your alert system, which keeps you going when something needs your attention. You fall asleep when the drive is high and the alertness is low.
You can be worn out from the day and still feel too alert to sleep. Most people mistake tired for sleepy, but they are not the same thing. Sleepy is heavy eyes, nodding off, losing your place in a book. Tired is wanting to stop, but still thinking through the day. They can feel similar until you get into bed.
A day spent solving problems can keep you alert well into the evening. You finish work, deal with things at home, then expect to fall asleep as soon as you lie down. But you haven't had much time to slow down, and now you're thinking about everything you didn't get to earlier.
Why this feels familiar to women leaders
If you're responsible for a lot at work and at home, you may not find time for yourself until bedtime. Then you finally have a quiet moment, and you're going over what was said in that meeting, what you should have said, and what's coming tomorrow, along with all other aspects of your work, family, friends, life, even lifestyle. Women as leaders encompass 360° of what is happening around us, and women perform this effort daily (and nightly).
Late work makes it worse. The screen, the decisions, the last email at ten all keep the alert system up long past the point where it should be winding down. Then you go to bed fifteen minutes later and expect a different result.
And yes, caffeine plays a part too. When you are running short on sleep you lean on caffeine harder, and it stays in your system for hours, holding alertness up exactly when you need it to fall.
The evening habits that keep it going
- Working right up to bedtime, with no gap between the last decision and the pillow.
- Evening screens, which keep both your mind and your eyes in daytime mode.
- Caffeine in the afternoon, and more of it when you are tired.
- Alcohol to unwind. It may help you fall asleep, but it can interrupt your sleep later in the night.
- Going to bed earlier because you are exhausted, which gives you more awake time, not more sleep.
- Dozing on the sofa in the evening, so you're less sleepy when you actually go to bed.
- Using the bed for the day's processing, until your brain learns that lying down is when thinking starts.
What helps you wind down for real
- Leave half an hour to an hour between finishing work and going to bed. Close the laptop, put work messages away, and do something that doesn't need another decision.
- Write down what's still on your mind earlier in the evening: what's unfinished and what you need to do tomorrow. If it comes up again in bed, you know you've already made a note of it.
- Lower the lights in the evening and put the screens down. Your system takes its cue from light.
- Stop caffeine by early afternoon and notice what alcohol actually does to your nights.
- Go to bed when you are sleepy, not when you are tired. Sleepy is heavy eyes and losing the thread. Tired is worn out and still alert, and going to bed on tired alone is what starts the lying awake.
- If you're nodding off on the sofa, go to bed if it's your bedtime. If it's still early, get up and do something gentle until you're ready for bed. In CBT-I, we allot a bedtime and wake time that works in your life; it's important to stick to a schedule to retrain your brain to sleep.
- Keep the same wake time every morning, weekends included. A consistent schedule helps your body clock.
- Notice whether you're holding tension in your jaw or shoulders. Relax them and breathe slowly, with a longer out-breath. Give yourself a few minutes without trying to make sleep happen.
These are some of the building blocks of CBT-I, the approach I teach. In my program we put them in the right order for your schedule, because timing matters, and some pieces work best with guidance rather than on your own.
When it is worth talking to your doctor
Being wired at night is usually about pace and habits. Sometimes there is more to it. Mention it to your doctor if you notice:
- Exhaustion that has been there for weeks and doesn't improve with rest or sleep
- A racing heart, feeling shaky, or anxiety that shows up during the day as well
- Night sweats, hot flashes, or other changes that came in around midlife
- Loud snoring, gasping, or pauses in your breathing
- Low mood, or losing interest in things you normally enjoy
Thyroid problems, hormone changes and anxiety can all look like this, and they are treatable. Please don't start, stop or change any medication or supplement without talking to your doctor first.
Related reading
- Neuroplasticity for Sleep: How Your Brain Relearns Sleep
How neuroplasticity for sleep connects with CBT-I, learned sleep patterns and practical retraining. Sandra White shares her story and a whole-life perspective. - Exhausted but Can't Sleep? Why It Happens and What Helps
You are exhausted all day, yet sleep will not come when you finally lie down. Here is why trying harder backfires and the steps that rebuild easy sleep. - Anxiety and Insomnia at Night: Breaking the Cycle
Anxiety at night keeps you awake, and poor sleep makes the anxiety louder. How the cycle works for high-achieving women and practical steps to quiet it. - Can Work Stress Cause Insomnia? What Leaders Should Know
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Can CBT-I help insomnia in perimenopause and menopause? How it compares with hormone therapy, whether you can use both, and how to choose your next step. - Why You Wake Up at 3 AM and What Helps You Sleep Again
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Find out which sleep pattern you have
Tired but wired is one pattern among several, and the right first step depends on which one is yours. The Find Your Sleep Profile quiz takes about two minutes and shows you what is driving your nights and what it means.
Find Your Sleep ProfileThis article is for education only and is not medical advice.