If people were in a closed room with no sunlight and clock would they know when to sleep and when to wake?

If people were in a closed room with no sunlight and clock would they know when to sleep and when to wake?
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In science experiment paralleling this question thee subjectsslept a lot during the initial stages but eventually adopted acircadian cycle of awake and asleep. It might not match the outsideworlds status but what difference does it make. There is no rulethat people have to set their internal clocks by your locationsexternal clock.
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