(BBC) — A full moon can disturb a good night’s sleep, scientists believe.

Researchers found evidence of a “lunar influence” in a study of 33 volunteers sleeping in tightly controlled laboratory conditions.

When the moon was round, the volunteers took longer to nod off and had poorer quality sleep, despite being shut in a darkened room, Current Biology reports.

They also had a dip in levels of a hormone called melatonin that is linked to natural-body clock cycles.

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