"The first night effect might change the next night's sleep," because the volunteers would have been more tired than usual, said Tamaki, explaining why the overnights were a week apart. The researchers discovered this by using sophisticated technology to scan the brains of a total of 35 young, healthy volunteers who spent two nights in the sleep lab, one week apart. The reason most people don't sleep well their first night in an unfamiliar room is because half of their brain is standing watch while the other half sleeps more deeply, the research suggests.
Tamaki coauthored a recent study in the journal Current Biology that uncovered an intriguing explanation for the FNE.
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