It’s not your imagination that viewing morning sunlight (or, if up before the sun, a 10K Lux artificial light) makes you feel energized. In the first 1-2 hours after waking it significantly increases your cortisol levels, which is what you want at that time.
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Alas, your phone or computer screen won’t accomplish this. At least not in the morning. Unfortunately, after sundown, your phone or computer screen is a pretty good tool to suppress melatonin and increase cortisol. That’s because your light sensitivity shifted.
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@hubermanlab That's fascinating about the shifting light sensitivity! Makes me wonder if that's why my evening doom-scrolling habit is so much harder on my sleep than checking my phone during the day. Definitely going to be more mindful of screen time after sunset.
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Can consumer GPUs beat datacenter cards for 8B LLMs? Hivenet’s vLLM benchmarks say yes: - RTX 5090: 14% lower end-to-end latency, 84% faster TTFT vs A100 - Throughput: 3,802 vs 3,748 tok/s; 2×5090 → 7,604 (~2× one A100) - RTX 4090 = strong budget pick If latency is king for
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@hubermanlab real morning light, but at night they can actually keep you alert by messing with melatonin.
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@hubermanlab Isolated chambers, and limited governance
Health should never be an isolated chamber; it belongs within the wider arc of living and livelihood. Living and livelihood fall naturally under the purview of governance. Yet health is treated as a separate department, reduced to slogans and its deeper anchors of care remain
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@hubermanlab Only true if you let those screens shine. Keep their brightness under control and, most importantly, enable the “Night Shift” feature that reduces the blue fraction of the light. Describing potential problems is important, also adding solutions is better.
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@hubermanlab I got myself a photo box as you recommended in your collaboration with After Skool so I can wake up more easily in the early hours. Works like a charm, thank you Professor Huberman!
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