UPDATE, 11:30 a.m.: We have an answer to the cause of the noise. Check out our latest report.

STATEN ISLAND, N.Y. -- Silly question: How did you sleep last night?

We're asking because Staten Islanders are abuzz with questions Tuesday morning about a loud and unusual noise waking them up around 3:30 a.m.

So far the Advance has received more than a dozen calls from borough residents reporting the mysterious sound in the wee hours of the morning, from all shores.

Readers described it as a long rumbling sound that went on and off for a while.

Some guessed thunder. Some guessed low-flying planes. One suggested some sort of steam release from a plant in Linden, N.J.

Several Staten Islanders posted clips of the noise on social media.

The most clear one may have been posted by Facebook user Christina Cip:

Here's one posted by YouTube user Chris McKinley:

Here's another by YouTube user STiinyourface, who described it as a "loud banging":

Here's another from YouTube:

So -- did you hear the noise?

If so, tell us where you live, what you heard and what you think it is in the comment field below.