Think it might be tinnitus?
Apparently it's more likely to be fish having sex.
Quote:
A mysterious humming noise which is keeping people awake at night could be down to fish making love, scientists claim.
The noise, which residents say 'pulsates' through their homes, starts at about 10pm and carries on all night, forcing some people to move away from the area because they find it impossible to sleep.
Scientists believe the noise could be being caused by fish having sex.
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http://www.telegraph.co.uk/news/news...king-fish.html