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sometimes I feel like an alien when I say that I need 8-9 hours sleep to feel awake the whole day. 6h seems to be normal nowadays.

Can I train to sleep (a little bit) less?

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No, but you can train to remember that eight hours is normal; it's the people who think six hours is normal - or rather, the ideology they've bought into - that's alien.

Me too. I normally need around 8–9 hours to function normally throughout the whole day – an hour more if I've been exercising regularly. It's highly impractical sometimes, but I've started to accept that I just need more sleep.

I can usually get by with less sleep (7 hours) and function somewhat normally if I go to bed and wake up at the same time every day, but I feel much better if I get a couple of hours more.

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