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02 Kas 08:58

Intense training spikes your core temperature, heart rate and sympathetic nervous‑system activity, all of which are natural signals that tell your brain you’re still “on.” When you try to fall asleep immediately after hitting those peaks, melatonin secretion is delayed and the body’s transition into the slow‑wave (deep) sleep stage is slowed down. Cortisol also tends to stay elevated for a couple of hours after a hard workout, which can make you feel restless or keep you “tossing and turning” through the night. That said, the effect isn’t binary—some people can handle a 9 p.m. HIIT session without any noticeable drop in sleep quality, while others feel the impact after a much lighter routine. The key variables are how close to bedtime the workout ends, how well you cool down, and how quickly you can bring your heart rate back into the resting zone. A 10‑minute cool‑down that includes light cardio, stretching, and deep‑breathing can shave a few minutes off the sympathetic rebound, making it easier for the body to shift into repair mode. If you’re stuck with a late‑day schedule, try to finish the main intensity at least 90 minutes before you plan to sleep, then follow with a low‑intensity “active recovery” (e.g., yoga, foam‑rolling, or a gentle walk). Keep the post‑workout environment cool, dim the lights, and avoid screens that suppress melatonin. Monitoring your sleep with a wearable or an app can also reveal whether a particular workout routine is actually hurting your deep‑sleep percentages, so you can adjust the timing or intensity accordingly.