Don't cut your nails at night
The most universally enforced rule in South Asian households, and the one with the most convincing explanation.
What's said
That cutting nails after sunset invites bad luck, angers Lakshmi, brings poverty, or displeases the ancestors. In some households it extends to hair, and to Saturdays and Tuesdays regardless of the hour.
Where it almost certainly comes from
Before electric light, this was done with a blade — a knife, a razor, or hand clippers — by the light of one oil lamp. Nails are small, fingers are soft, and shadows are unhelpful. A cut in a household with no antiseptic and no antibiotics could genuinely become serious. "It brings bad luck" is a rule a child obeys; "you may cut yourself in the dark and the wound may turn bad" is a lecture a child argues with.
There's a second, tidier reason: clippings scattered on a floor that people sit and eat on, swept by hand, in a house lit by one lamp. Nobody wants to be finding those in the morning — and in traditions where anything from your body can be used against you, you certainly don't want them lying about.
What survives
Electric light removed the danger and the rule stayed, which is what usually happens. Ask a Desi adult if they believe it and most will say no; watch them at 10pm with a pair of clippers and a surprising number will wait until morning.
More rules like this: grandmother's warnings.
Last updated: 2026-08-11
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