Park your car over the manhole so everyone has to drive around it. Problem solved.

You'll never sleep in again. Which in some cases, people need.

I suppose the only thing to do now is adjust your schedule to go to sleep at 8 p.m. Sharp for a good night's 8 hour sleep. On the other hand, #1's advice is about 1000 times better than mine.

First world problems lol

Maybe a white noise machine would help drown out the sound?

Remember that scene in Toy Story where they hide under cones to cross the street? You know what to do

Oh man, same thing is happening to me, just a bit further away, but still annoying! I feel your pain OP

MacGyver your way out of this. Time to duct tape a yoga mat over that sucker.

So is the noise coming from the fact it is hollow or that the manhole cover is loose in the hole? I know this may seem like an arbitrary distinction...but I have some ideas. If the construction has made it a permanent manhole, you could use a silicon based putty around the outside to make it fit more snugly (not to seal it shut, although I doubt anyone could prove that was you). If it's the hollowness...I don't know if putting sandbags underneath may absorb some of the noise. That one is less of an option if the construction is on going. You could just drag something heavy and flat over it every night, which I assume would buy you some time before the construction workers removed it every morning. But a crowbar and the cover of night, with an Macgyver imagination and dedication to sleep...can really achieve amazing things.

Someone need to fix that, complain. I have moved three times now and been followed by the same construction company... pure coincidence but drives me crazy...