“Scientists identify molecular link between sleep and mood”

“Sleep goes hand-in-hand with mood. People suffering from depression and mania, for example, frequently have altered sleeping patterns, as do those with seasonal affective disorder (SAD). And although no one knows exactly how these changes come about, in SAD sufferers they are influenced by changes in light exposure, the brain’s time-keeping cue. But is mood affecting sleep, is sleep affecting mood, or is there a third factor influencing both?…
PER3’s role in mood regulation has never been demonstrated directly before,” she says. “Our results indicate that PER3 might function in helping us adjust to seasonal changes,” by modifying the body’s internal clock.”
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