sleep mode or disable pins

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can help. i`m having hard time making sketch sleep mode in arduino uno. don`t understand tutorials in youtube. need code it. triggering device light dependet resistor, function be; if night arduino in sleep mode. in advance guys  :)  :)

have read (rather @ videos) nick's blog

power
interrupts

understand what's written there, post best attempt @ commented code. (within code tags)


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