Your next step should be to go to Landlord Tenant Court to stop your landlord from continuing the work or to abate - or reduce - your rent for the entire time that the construction is going on AND to ask that the court limit construction to hours that are reasonable to you given your work situation. You have a right to "quiet enjoyment" of your apartment.  You paying rent helps to secure these rights.  I would also review your lease to make sure that you did not agree to this in any way (like if the construction was anticipated and you inadvertantly consented) but I am pretty sure that this access and disruptive behavior is not sanctioned therein.  God luck.