Getting a decent sleep can be difficult when things go 'bump' in the night.
But that's the reality for residents of a quiet street on Auckland's North Shore/Te Raki Paewhenua, who have been kept awake by a mysterious banging sound, and even the council is scratching their heads.
The hammering sound has been happening every night since early July, keeping residents at Selwyn Crescent in Forrest Hill awake, sometimes into the early morning hours.
Selwyn Crescent resident Lizzie Oakes first started hearing it last month.
"Like an underground thump, [it's] almost like somebody's driving a pile into the ground. For some reason it seems to happen predominantly at night," she told Newshub.
The noise is keeping Oakes' neighbours up too.
Laura lives a few houses down the street and has young children who have been struggling to sleep.
"[It's] this really, really loud banging, and it starts at about 8pm at night and it keeps going until about 5am and it wakes us up - and our kids up," she said.
Auckland Council has visited the street twice after the noise was thought to be coming from underneath one house in particular.
A camera was set up under the house earlier this month to capture more evidence.
"The house where it's happening and where the stormwater pipes are under, the house is reacting and vibrating and shaking so violently, and when that happened, a whole lot of us neighbours thought somebody was doing DIY at 4am," Oakes told Newshub.
The spooky sound could be a stormwater pipe that runs underneath the street, but when Auckland Council staff went to check by lowering a camera into the pipe, it didn't discover anything.
So, the situation has been escalated to stormwater engineers to investigate further, who turned up just as Newshub was filming on Thursday.
"Our next steps will be to gather further details from residents and examine the camera footage to see if we can identify an issue," an Auckland Council spokesperson said.
The engineers again lowered a camera into the stormwater pipe, checking for abnormalities that could help them identify the source of the banging.
"I just don't think people realise the stress that it's had on people," said Oakes.
"Bit of a mystery," Laura added.
But if the council can't figure it out, maybe it's a job for Mystery Inc.
Whatever the noise is, it's a bump in the night these residents have had enough of.
