Tired but Wired: How Stress and Burnout Hijack Your Sleep

The body's stress response is built for short bursts: a threat appears, your heart rate and alertness climb, and once it passes, the system settles. Sleep needs the opposite. Your nervous system has to downshift before you can drift off. Sleep researchers describe chronic insomnia as a state of hyperarousal. A major review found signs of heightened arousal in people with insomnia across many body systems, from nervous-system activity and stress hormones to brain-wave patterns, during the day as well as at night. Worry and rumination were among the key factors keeping the pattern going. Work is one of the biggest sources of that arousal, and the effect runs both ways. In a two‒year study of nearly 4,800 Swedish workers, higher work demands predicted more disturbed sleep later on, and disturbed sleep predicted more stress, heavier demands and less support at work. Notably, long hours and shift schedules didn't predict sleep problems. The psychological weight of the job did. That's why switching off matters so much. In a daily diary study of health‒care workers, bad moods from work followed people home and often lingered into the next morning, but mentally detaching from work in the evening, along with better sleep, weakened that carryover. For high performers, this is the hard part. Answering "just one more email" at 10 p.m. keeps your stress system engaged right when it needs to wind down.

Two hormones run your sleep-wake cycle like a relay team. Cortisol peaks in the morning to help you wake up and get going, then gradually falls through the day, reaching its low point around bedtime. As cortisol fades in the evening, melatonin rises and signals to your body that it's time to sleep. Chronic stress disrupts both sides of that handoff. Cortisol stops falling at night. A large meta‒analysis of human stress research found that ongoing stress is linked to a flatter daily cortisol rhythm, with a weaker rise in the morning and higher-than-normal levels in the afternoon and evening. The hormone meant to get you moving is still elevated when you're trying to wind down, which fits the "tired but wired" feeling. The stress system also appears to interfere with melatonin, the hormone that tells your body it's time to sleep. Late nights in front of bright screens make it worse, since evening light suppresses melatonin even further. That "quick check" of email in bed can delay the very signal your body needs to wind down. With burnout, the morning boost can fade. Over time, a stress system that has been running hot can start to wear down. The cortisol rise that normally helps you wake up and feel alert can weaken with burnout. That may be why burnout so often feels like being wired at night and drained in the morning. Research on stress hormones is still evolving, so this is part of the picture rather than the whole story. But together, these shifts match what many stressed and burned-out specialists describe: alert and restless at night, then flat and foggy in the morning, no matter how long they stayed in bed.

Illustrative relative hormone levels (0–100), independently normalized. Chronic stress and burnout do not produce one universal hormonal pattern. Blue Line: Cortisol - Green Line: Melatonin

Start by getting tomorrow out of your head. In a sleep‒lab study, people who spent five minutes writing a to-do list before bed fell asleep faster than people who wrote about what they'd already finished, and the more specific the list, the faster they drifted off. From there, give your brain clear signals that the day is over. A short end-of-workday ritual, like reviewing tomorrow's calendar, closing the laptop and changing clothes, marks the shift. Protect the last 30 to 60 minutes before bed for something calm and unrelated to work, such as reading, a warm shower or light stretching. And if you've been lying awake for a while, get up and do something quiet in dim light until you feel sleepy, so your bed doesn't become the place where you worry. If poor sleep has lasted more than a few weeks, it's worth getting support. Poor sleep under stress isn't a willpower problem. It's a nervous system stuck in the "on" position. The goal isn't to force sleep, but to give your body consistent signals that it's safe to rest.

Poor sleep under stress isn't a willpower problem. It's a nervous system stuck in the "on" position, with cortisol staying high when it should be falling and melatonin struggling to do its job. You can't force your way to sleep, but you can give your body clear, consistent signals that the day is over and it's safe to rest. And when stress has settled in for the long haul, addressing it directly is one of the most effective ways to get your sleep back.

Sources: 1. Riemann, D., et al. (2010). The hyperarousal model of insomnia. Sleep Medicine Reviews. 2. Åkerstedt, T., et al. (2015). Work and sleep: A prospective study. Sleep. 3. Sonnentag, S., & Binnewies, C. (2013). Daily affect spillover from work to home. Journal of Vocational Behavior. 4. Miller, G. E., et al. (2007). Chronic stress and the HPA axis in humans. Psychological Bulletin. 5. Kellner, M., et al. (1997). Corticotropin-releasing hormone inhibits melatonin secretion in healthy volunteers. Neuroendocrinology. 6. Oosterholt, B. G., et al. (2015). Burnout and cortisol. Journal of Psychosomatic Research. 7. Scullin, M. K., et al. (2018). The effects of bedtime writing on difficulty falling asleep. Journal of Experimental Psychology: General.