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Was your grandma a caffeine addicted? My mom is sleeping, since when I remember, just 4-5 hours each night but she also takes 3 strong coffees during all the day and if she forget even one she instantly feels much more tired than usual.

A shame I can't try because I am intolerant to caffeine that basically causes my stomach to hurt for hours... I would really like to halve my sleep need.

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Caffeine definitely cannot reduce your need for sleep long-term. Your body habituates to it, like any stimulant; after a while, the caffeine isn't making you more alert than normal, but it's required just to get up to normal. If your mother gets by on 4-5 hours a night long-term, it's because she's a natural short sleeper, not because of the caffeine.

Seems like that would be explained from the caffeine withdrawal. Doesn't necessarily indicate she would need sleep more if she had less coffee.

Anyways there are many ways to ingest caffeine besides coffee.

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