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Adelie penguins usually sleep on rocks. If they are taking care of an egg, they will sleep standing up. Like most penguins, Adelie don't sleep for very long, instead they take short naps.
No penguins can sleep on water.
Penguins do not have a regular sleep pattern. They sleep when they have the chance to, which can be any time of the day or night, but they do not usually sleep for long periods of time.
they dont really sleep
Yes Penguins do sleep standing up. Father penguins especially because when the mother has an egg they protect it between their feet and stomach.
they sleep on there bellies to keep very warm
Penguins sleep on ice, either on Antarctica's beaches where they breed, or on ice floes in open water.
yes
they sleep while standing up and hudled in a group.
they sleep in nest made out of rocks
Unlike us, penguins never really sleep - they take short naps during the day and night because they have so many predators. Some penguins, like the fairy penguin, have burrows and can take a longer sleep if they're safe inside, but the rest of them only sleep for a few minutes at a time.